295 lines
17 KiB
JSON
295 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-66296",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-07-24T14:10:01.114Z",
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"datePublished": "2026-08-03T19:04:30.556Z",
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"dateUpdated": "2026-08-03T19:50:27.860Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:lud:oaskit:*:*:*:*:*:elixir:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"Elixir.Oaskit.ErrorHandler.Default"
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],
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"packageName": "oaskit",
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"packageURL": "pkg:hex/oaskit",
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"product": "oaskit",
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"programFiles": [
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"lib/oaskit/error_handler/default.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Oaskit.ErrorHandler.Default':format_reason/4"
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},
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{
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"name": "'Elixir.Oaskit.ErrorHandler.Default':reason_to_html/1"
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}
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],
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"repo": "https://github.com/lud/oaskit",
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"vendor": "lud",
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"versions": [
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{
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"lessThan": "0.14.1",
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"status": "affected",
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"version": "0.1.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:lud:oaskit:*:*:*:*:*:elixir:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"Elixir.Oaskit.ErrorHandler.Default"
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],
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"packageName": "lud/oaskit",
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"packageURL": "pkg:github/lud/oaskit",
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"product": "oaskit",
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"programFiles": [
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"lib/oaskit/error_handler/default.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Oaskit.ErrorHandler.Default':format_reason/4"
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},
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{
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"name": "'Elixir.Oaskit.ErrorHandler.Default':reason_to_html/1"
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}
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],
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"repo": "https://github.com/lud/oaskit",
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"vendor": "lud",
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"versions": [
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{
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"lessThan": "b70c6b2eaf0b11bdd0bbb21b8a87dbb3d46918a1",
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"status": "affected",
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"version": "552de8ca0ff60617bea58bcafa451892d61a161c",
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"versionType": "git"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:lud:oaskit:*:*:*:*:*:elixir:*:*",
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"versionEndExcluding": "0.14.1",
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"versionStartIncluding": "0.1.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Ludovic Dem"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Ludovic Dem"
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},
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{
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"lang": "en",
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"type": "analyst",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"datePublic": "2026-07-05T00:00:00.000Z",
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in lud oaskit allows reflected cross-site scripting via the default HTML error handler.</p>\n<p><code>Oaskit.ErrorHandler.Default.format_reason/4</code> and <code>Oaskit.ErrorHandler.Default.reason_to_html/1</code> in <code>lib/oaskit/error_handler/default.ex</code> render request-validation failures as an HTML page whenever the request's <code>Accept</code> header contains <code>html</code>, interpolating request-controlled strings into that page without HTML escaping. The unescaped values are object keys taken from a request body or from an object or <code>deepObject</code> query parameter, which appear in the JSON Schema error's instance path when a schema rejects them (for example under <code>additionalProperties: false</code>), and the raw <code>Content-Type</code> header, reflected in unsupported-media-type errors when it fails to parse.</p>\n<p>Because browsers send <code>Accept: text/html</code> on ordinary top-level navigation, a crafted GET link is sufficient to trigger the error page; no form submission, custom <code>Content-Type</code>, or attacker-controlled script on the victim's side is required. A payload such as <code>filter[</code></h2><script>alert(document.domain)</script>]=x</code> terminates the enclosing markup and the injected script executes in the origin of the application using oaskit, giving it access to that origin's cookies, session, and same-origin responses.</p>\n<p>Both HTML error rendering and the vulnerable handler are enabled by default: <code>Oaskit.Plugs.ValidateRequest</code> defaults <code>:html_errors</code> to <code>true</code> and <code>:error_handler</code> to <code>Oaskit.ErrorHandler.Default</code>, so applications following the documented usage are affected without any opt-in.</p>\n<p>This issue affects oaskit: from 0.1.0 before 0.14.1.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in lud oaskit allows reflected cross-site scripting via the default HTML error handler.\n\n`Oaskit.ErrorHandler.Default.format_reason/4` and `Oaskit.ErrorHandler.Default.reason_to_html/1` in `lib/oaskit/error_handler/default.ex` render request-validation failures as an HTML page whenever the request's `Accept` header contains `html`, interpolating request-controlled strings into that page without HTML escaping. The unescaped values are object keys taken from a request body or from an object or `deepObject` query parameter, which appear in the JSON Schema error's instance path when a schema rejects them (for example under `additionalProperties: false`), and the raw `Content-Type` header, reflected in unsupported-media-type errors when it fails to parse.\n\nBecause browsers send `Accept: text/html` on ordinary top-level navigation, a crafted GET link is sufficient to trigger the error page; no form submission, custom `Content-Type`, or attacker-controlled script on the victim's side is required. A payload such as `filter[</code></h2><script>alert(document.domain)</script>]=x` terminates the enclosing markup and the injected script executes in the origin of the application using oaskit, giving it access to that origin's cookies, session, and same-origin responses.\n\nBoth HTML error rendering and the vulnerable handler are enabled by default: `Oaskit.Plugs.ValidateRequest` defaults `:html_errors` to `true` and `:error_handler` to `Oaskit.ErrorHandler.Default`, so applications following the documented usage are affected without any opt-in.\n\nThis issue affects oaskit: from 0.1.0 before 0.14.1."
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}
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],
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"value": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in lud oaskit allows reflected cross-site scripting via the default HTML error handler.\n\nOaskit.ErrorHandler.Default.format_reason/4 and Oaskit.ErrorHandler.Default.reason_to_html/1 in lib/oaskit/error_handler/default.ex render request-validation failures as an HTML page whenever the request's Accept header contains html, interpolating request-controlled strings into that page without HTML escaping. The unescaped values are object keys taken from a request body or from an object or deepObject query parameter, which appear in the JSON Schema error's instance path when a schema rejects them (for example under additionalProperties: false), and the raw Content-Type header, reflected in unsupported-media-type errors when it fails to parse.\n\nBecause browsers send Accept: text/html on ordinary top-level navigation, a crafted GET link is sufficient to trigger the error page; no form submission, custom Content-Type, or attacker-controlled script on the victim's side is required. A payload such as filter[</code></h2><script>alert(document.domain)</script>]=x terminates the enclosing markup and the injected script executes in the origin of the application using oaskit, giving it access to that origin's cookies, session, and same-origin responses.\n\nBoth HTML error rendering and the vulnerable handler are enabled by default: Oaskit.Plugs.ValidateRequest defaults :html_errors to true and :error_handler to Oaskit.ErrorHandler.Default, so applications following the documented usage are affected without any opt-in.\n\nThis issue affects oaskit: from 0.1.0 before 0.14.1."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-591",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-591 Reflected XSS"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 5.1,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "LOW",
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"subIntegrityImpact": "LOW",
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"userInteraction": "ACTIVE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-79",
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"description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-08-03T19:04:30.556Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/lud/oaskit/security/advisories/GHSA-h7xw-x8wr-xpcc"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-66296.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66296"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/lud/oaskit/commit/b70c6b2eaf0b11bdd0bbb21b8a87dbb3d46918a1"
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}
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],
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"source": {
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"discovery": "INTERNAL"
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},
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"title": "Reflected XSS in oaskit's default HTML error handler",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Disable HTML error rendering so that validation failures are returned as JSON only:</p>\n<pre><code class=\"language-elixir\">plug Oaskit.Plugs.ValidateRequest, html_errors: false\n</code></pre>\n<p>This prevents the vulnerable HTML page from being rendered at all, on any oaskit version. Alternatively, configure a custom <code>:error_handler</code> that does not emit HTML built from request-derived values.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Disable HTML error rendering so that validation failures are returned as JSON only:\n\n```elixir\nplug Oaskit.Plugs.ValidateRequest, html_errors: false\n```\n\nThis prevents the vulnerable HTML page from being rendered at all, on any oaskit version. Alternatively, configure a custom `:error_handler` that does not emit HTML built from request-derived values."
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}
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],
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"value": "Disable HTML error rendering so that validation failures are returned as JSON only:\n\nplug Oaskit.Plugs.ValidateRequest, html_errors: false\n\nThis prevents the vulnerable HTML page from being rendered at all, on any oaskit version. Alternatively, configure a custom :error_handler that does not emit HTML built from request-derived values."
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}
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]
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/lud/oaskit/security/advisories/GHSA-h7xw-x8wr-xpcc",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-03T19:50:03.665445Z",
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"id": "CVE-2026-66296",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-03T19:50:27.860Z"
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}
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}
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]
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}
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} |