{"id":"CVE-2026-126069","state":"PUBLISHED","title":"Action View: Possible XSS vulnerability in Action View tag helpers","description":"Action View is a framework for handling view template lookup and rendering and provides view helpers for building HTML. Prior to 8.1.4.1 and 8.0.5.2, the fix for CVE-2026-33168 skips blank HTML attribute names in Action View tag helpers, but it tests the name before converting it to a string. A Symbol name made only of whitespace, such as :\" \", is not blank, because Symbol#blank? is Symbol#empty?, so it reaches the attribute escaping, which emits an attribute with no name and produces malformed HTML. The asset tag helpers, such as image_tag, video_tag and audio_tag, symbolize their options, so a whitespace String name passed to them takes the same path. A carefully crafted attribute value could then be misinterpreted by the browser as a separate attribute name, possibly leading to XSS. Applications that allow users to specify custom HTML attribute names are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.","publishedAt":"2026-11-10T20:36:59.705Z","updatedAt":"2026-11-10T20:36:59.705Z","severity":{"score":4.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["rails rails"],"affected":[{"vendor":"rails","product":"rails","versions":[{"version":">= 8.1, < 8.1.4.1","status":"affected"},{"version":"< 8.0.5.2","status":"affected"}]}],"references":["https://github.com/rails/rails/security/advisories/GHSA-68p9-83h6-5wpj","https://github.com/rails/rails/commit/9190210606ffe52f92fdc75637f8ff69404f22c8","https://github.com/rails/rails/commit/f47452533e1f28d847c63181b9d5f8b7243ef9a4","https://github.com/rails/rails/releases/tag/v8.0.5.2","https://github.com/rails/rails/releases/tag/v8.1.4.1"],"weaknesses":["CWE-79"],"ingestedAt":"2026-11-10T20:40:07.140Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/126xxx/CVE-2026-126069.json","commit":"157eb5d118e551c768161ca38580270cc29d40b3","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-126069","state":"PUBLISHED","datePublished":"2026-11-10T20:36:59.705Z","dateUpdated":"2026-11-10T20:36:59.705Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-11-10T17:07:43.283Z"},"containers":{"cna":{"title":"Action View: Possible XSS vulnerability in Action View tag helpers","descriptions":[{"lang":"en","value":"Action View is a framework for handling view template lookup and rendering and provides view helpers for building HTML. Prior to 8.1.4.1 and 8.0.5.2, the fix for CVE-2026-33168 skips blank HTML attribute names in Action View tag helpers, but it tests the name before converting it to a string. A Symbol name made only of whitespace, such as :\" \", is not blank, because Symbol#blank? is Symbol#empty?, so it reaches the attribute escaping, which emits an attribute with no name and produces malformed HTML. The asset tag helpers, such as image_tag, video_tag and audio_tag, symbolize their options, so a whitespace String name passed to them takes the same path. A carefully crafted attribute value could then be misinterpreted by the browser as a separate attribute name, possibly leading to XSS. Applications that allow users to specify custom HTML attribute names are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2."}],"affected":[{"vendor":"rails","product":"rails","versions":[{"version":">= 8.1, < 8.1.4.1","status":"affected"},{"version":"< 8.0.5.2","status":"affected"}]}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-68p9-83h6-5wpj","name":"https://github.com/rails/rails/security/advisories/GHSA-68p9-83h6-5wpj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rails/rails/commit/9190210606ffe52f92fdc75637f8ff69404f22c8","name":"https://github.com/rails/rails/commit/9190210606ffe52f92fdc75637f8ff69404f22c8","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/commit/f47452533e1f28d847c63181b9d5f8b7243ef9a4","name":"https://github.com/rails/rails/commit/f47452533e1f28d847c63181b9d5f8b7243ef9a4","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","name":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","name":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-11-10T20:36:59.705Z"},"source":{"advisory":"GHSA-68p9-83h6-5wpj","discovery":"UNKNOWN"}}}}}