304 lines
15 KiB
JSON
304 lines
15 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-2026-54889",
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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": "2026-06-16T10:47:13.915Z",
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"datePublished": "2026-06-29T19:10:49.841Z",
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"dateUpdated": "2026-06-30T04:38:42.158Z"
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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:leandrocp:mdex:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MDEx'",
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"'Elixir.MDEx.DeltaConverter'"
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],
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"packageName": "mdex",
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"packageURL": "pkg:hex/mdex",
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"product": "mdex",
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"programFiles": [
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"lib/mdex.ex",
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"lib/mdex/delta_converter.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.MDEx':to_delta/2"
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},
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{
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"name": "'Elixir.MDEx.DeltaConverter':convert/2"
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},
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{
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"name": "'Elixir.MDEx.DeltaConverter':default_convert_node/3"
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}
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],
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"repo": "https://github.com/leandrocp/mdex",
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"vendor": "leandrocp",
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"versions": [
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{
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"lessThan": "0.13.2",
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"status": "affected",
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"version": "0.8.3",
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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:leandrocp:mdex:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MDEx'",
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"'Elixir.MDEx.DeltaConverter'"
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],
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"packageName": "leandrocp/mdex",
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"packageURL": "pkg:github/leandrocp/mdex",
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"product": "mdex",
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"programFiles": [
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"lib/mdex.ex",
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"lib/mdex/delta_converter.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.MDEx':to_delta/2"
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},
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{
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"name": "'Elixir.MDEx.DeltaConverter':convert/2"
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},
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{
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"name": "'Elixir.MDEx.DeltaConverter':default_convert_node/3"
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}
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],
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"repo": "https://github.com/leandrocp/mdex",
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"vendor": "leandrocp",
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"versions": [
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{
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"lessThan": "2817147f5b87ce7186aa604c9ee72499485b8f2f",
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"status": "affected",
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"version": "9852db2456fdc9d856eb636603a7f608e22e3793",
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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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"configurations": [
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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>The application must pass untrusted Markdown to <tt>'Elixir.MDEx':to_delta/2</tt> and then render the resulting Quill Delta to HTML with a renderer that maps the <tt>\"link\"</tt> and <tt>\"image\"</tt> attributes to <tt>href</tt> and <tt>src</tt> without applying its own URL scheme sanitization (for example <tt>quill-delta-to-html</tt> or the Quill client).</p>"
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}
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],
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"value": "The application must pass untrusted Markdown to 'Elixir.MDEx':to_delta/2 and then render the resulting Quill Delta to HTML with a renderer that maps the \"link\" and \"image\" attributes to href and src without applying its own URL scheme sanitization (for example quill-delta-to-html or the Quill client)."
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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:leandrocp:mdex:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.13.2",
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"versionStartIncluding": "0.8.3",
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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": "Peter Ullrich"
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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": "Leandro Pereira"
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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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"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": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in leandrocp mdex allows cross-site scripting via unsanitized URL schemes in Quill Delta output.<p><tt>'Elixir.MDEx':to_delta/2</tt> converts Markdown into a Quill Delta. <tt>'Elixir.MDEx.DeltaConverter':default_convert_node/3</tt> in <tt>lib/mdex/delta_converter.ex</tt> copies the URL of a link, wikilink, or image node directly from the parsed Markdown into the Delta <tt>\"link\"</tt> or <tt>\"image\"</tt> attribute without applying a scheme allowlist or any normalization.</p><p>An attacker who controls the Markdown text can supply a <tt>javascript:</tt> URL (for example <tt>[click](javascript:alert(document.cookie))</tt>) that survives verbatim into the Delta attribute. When the Delta is rendered to HTML by a downstream renderer (such as <tt>quill-delta-to-html</tt> or the Quill client), the attribute becomes an <tt><a href></tt> or <tt><img src></tt>, and the <tt>javascript:</tt> scheme executes in the browser of anyone who views the rendered content. The link and wikilink cases are the strongest vectors because <tt>javascript:</tt> in an <tt>href</tt> executes on click; the image case is lower impact because <tt>javascript:</tt> in <tt><img src></tt> generally does not execute in modern browsers.</p><p>This issue affects mdex: from 0.8.3 before 0.13.2.</p>"
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}
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],
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"value": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in leandrocp mdex allows cross-site scripting via unsanitized URL schemes in Quill Delta output.\n\n'Elixir.MDEx':to_delta/2 converts Markdown into a Quill Delta. 'Elixir.MDEx.DeltaConverter':default_convert_node/3 in lib/mdex/delta_converter.ex copies the URL of a link, wikilink, or image node directly from the parsed Markdown into the Delta \"link\" or \"image\" attribute without applying a scheme allowlist or any normalization.\n\nAn attacker who controls the Markdown text can supply a javascript: URL (for example [click](javascript:alert(document.cookie))) that survives verbatim into the Delta attribute. When the Delta is rendered to HTML by a downstream renderer (such as quill-delta-to-html or the Quill client), the attribute becomes an <a href> or <img src>, and the javascript: scheme executes in the browser of anyone who views the rendered content. The link and wikilink cases are the strongest vectors because javascript: in an href executes on click; the image case is lower impact because javascript: in <img src> generally does not execute in modern browsers.\n\nThis issue affects mdex: from 0.8.3 before 0.13.2."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-244",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-244 XSS Targeting URI Placeholders"
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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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"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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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "LOW",
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"subIntegrityImpact": "LOW",
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"userInteraction": "ACTIVE",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/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": "LOW",
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"vulnIntegrityImpact": "LOW"
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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": "2026-06-30T04:38:42.158Z"
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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/leandrocp/mdex/security/advisories/GHSA-4383-7xfp-gpph"
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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-2026-54889.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-2026-54889"
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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/leandrocp/mdex/commit/2817147f5b87ce7186aa604c9ee72499485b8f2f"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Unsanitized URL schemes in MDEx Quill Delta output allow javascript: injection (XSS)",
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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>Sanitize the Quill Delta produced by <tt>'Elixir.MDEx':to_delta/2</tt> before rendering it: drop or blank any <tt>\"link\"</tt> or <tt>\"image\"</tt> value whose URL scheme is not in a safe allowlist (<tt>http</tt>, <tt>https</tt>, <tt>mailto</tt>, <tt>tel</tt>).</p>"
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}
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],
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"value": "Sanitize the Quill Delta produced by 'Elixir.MDEx':to_delta/2 before rendering it: drop or blank any \"link\" or \"image\" value whose URL scheme is not in a safe allowlist (http, https, mailto, tel)."
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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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/leandrocp/mdex/security/advisories/GHSA-4383-7xfp-gpph",
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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": "2026-06-29T20:48:34.044130Z",
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"id": "CVE-2026-54889",
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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": "2026-06-29T20:48:52.206Z"
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}
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}
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]
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}
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} |