295 lines
16 KiB
JSON
295 lines
16 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-2026-82756",
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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": "2026-08-31T01:00:10.817Z",
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"datePublished": "2026-09-07T22:30:55.280Z",
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"dateUpdated": "2026-09-08T14:43:33.571Z"
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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:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.AshAuthentication.Phoenix.Oauth2Server.BearerPlug'",
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"'Elixir.AshAuthentication.Phoenix.Oauth2Server.RequireScopePlug'"
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],
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"packageName": "ash_authentication_oauth2_server",
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"packageURL": "pkg:hex/ash_authentication_oauth2_server",
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"product": "ash_authentication_oauth2_server",
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"programFiles": [
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"lib/ash_authentication_phoenix/oauth2_server/bearer_plug.ex",
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"lib/ash_authentication_phoenix/oauth2_server/require_scope_plug.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.BearerPlug':call/2"
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},
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{
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"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.RequireScopePlug':call/2"
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}
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],
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"repo": "https://github.com/ash-project/ash_authentication_oauth2_server",
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"vendor": "ash-project",
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"versions": [
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{
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"lessThan": "0.3.1",
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"status": "affected",
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"version": "0.1.3",
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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:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.AshAuthentication.Phoenix.Oauth2Server.BearerPlug'",
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"'Elixir.AshAuthentication.Phoenix.Oauth2Server.RequireScopePlug'"
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],
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"packageName": "ash-project/ash_authentication_oauth2_server",
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"packageURL": "pkg:github/ash-project/ash_authentication_oauth2_server",
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"product": "ash_authentication_oauth2_server",
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"programFiles": [
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"lib/ash_authentication_phoenix/oauth2_server/bearer_plug.ex",
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"lib/ash_authentication_phoenix/oauth2_server/require_scope_plug.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.BearerPlug':call/2"
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},
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{
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"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.RequireScopePlug':call/2"
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}
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],
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"repo": "https://github.com/ash-project/ash_authentication_oauth2_server",
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"vendor": "ash-project",
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"versions": [
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{
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"lessThan": "09f97476715da031b136eaec7b2cda2363ad8149",
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"status": "affected",
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"version": "99de0a1cacb5ef667c4533278b7c81ca98c00231",
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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>Reachable only in a multi-tenant application that derives the Ash tenant from request-controlled input (subdomain, <code>Host</code>, path, or header) and uses <code>BearerPlug</code> or <code>RequireScopePlug</code>; the tenant reaches the challenge through the server's tenant-aware <code>resource_url</code>.</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": "Reachable only in a multi-tenant application that derives the Ash tenant from request-controlled input (subdomain, `Host`, path, or header) and uses `BearerPlug` or `RequireScopePlug`; the tenant reaches the challenge through the server's tenant-aware `resource_url`."
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}
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],
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"value": "Reachable only in a multi-tenant application that derives the Ash tenant from request-controlled input (subdomain, Host, path, or header) and uses BearerPlug or RequireScopePlug; the tenant reaches the challenge through the server's tenant-aware resource_url."
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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:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.3.1",
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"versionStartIncluding": "0.1.3",
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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": "reporter",
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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": "Zach Daniel / Ash Project"
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},
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{
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"lang": "en",
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"type": "coordinator",
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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": "<p>Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into the <code>WWW-Authenticate</code> challenge header.</p>\n<p><code>BearerPlug</code> and <code>RequireScopePlug</code> built the <code>Bearer resource_metadata=\"...\"</code> challenge by interpolating a <code>resource_metadata</code> URL derived from the request tenant directly into the quoted value. In a multi-tenant application that sets the Ash tenant from request-controlled data (a subdomain, the <code>Host</code>, a path segment, or a header), a tenant containing a <code>\"</code> closes the quoted value and appends attacker-chosen auth-params, including a second <code>resource_metadata</code> URL pointing at an attacker-controlled authorization server that spec-following clients follow. Carriage returns and line feeds are rejected by Plug, so this is parameter injection within one header, not response splitting.</p>\n<p>This issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.</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 Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into the `WWW-Authenticate` challenge header.\n\n`BearerPlug` and `RequireScopePlug` built the `Bearer resource_metadata=\"...\"` challenge by interpolating a `resource_metadata` URL derived from the request tenant directly into the quoted value. In a multi-tenant application that sets the Ash tenant from request-controlled data (a subdomain, the `Host`, a path segment, or a header), a tenant containing a `\"` closes the quoted value and appends attacker-chosen auth-params, including a second `resource_metadata` URL pointing at an attacker-controlled authorization server that spec-following clients follow. Carriage returns and line feeds are rejected by Plug, so this is parameter injection within one header, not response splitting.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1."
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}
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],
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"value": "Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into the WWW-Authenticate challenge header.\n\nBearerPlug and RequireScopePlug built the Bearer resource_metadata=\"...\" challenge by interpolating a resource_metadata URL derived from the request tenant directly into the quoted value. In a multi-tenant application that sets the Ash tenant from request-controlled data (a subdomain, the Host, a path segment, or a header), a tenant containing a \" closes the quoted value and appends attacker-chosen auth-params, including a second resource_metadata URL pointing at an attacker-controlled authorization server that spec-following clients follow. Carriage returns and line feeds are rejected by Plug, so this is parameter injection within one header, not response splitting.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-153",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-153 Input Data Manipulation"
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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": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 6.3,
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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": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/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": "NONE",
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"vulnIntegrityImpact": "LOW",
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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-116",
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"description": "CWE-116 Improper Encoding or Escaping of Output",
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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": "2026-09-07T22:30:55.280Z"
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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/ash-project/ash_authentication_oauth2_server/security/advisories/GHSA-2h3v-83jg-2qmm"
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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-2026-82756.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-2026-82756"
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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/ash-project/ash_authentication_oauth2_server/commit/09f97476715da031b136eaec7b2cda2363ad8149"
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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": "ash_authentication_oauth2_server interpolates a tenant-derived value into the WWW-Authenticate challenge without escaping, allowing header parameter injection"
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},
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"adp": [
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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": "2026-09-08T14:43:23.093058Z",
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"id": "CVE-2026-82756",
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"options": [
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{
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"Exploitation": "none"
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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": "2026-09-08T14:43:33.571Z"
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}
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}
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]
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}
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} |