{"id":"CVE-2026-126079","state":"PUBLISHED","title":"Action View: Possible XSS vulnerability in Action View text 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, with the HTML5 sanitizer (Rails::HTML5::Sanitizer, the default vendor on CRuby for applications using load_defaults 7.1 or later), Nokogiri before 1.19.5 serializes < and > unescaped inside attribute values. The Action View text helpers highlight and simple_format sanitize their input and then process the resulting HTML as a string: highlight splits it on tag boundaries to insert matches, and simple_format splits it into paragraphs on blank lines. An unescaped > or a blank line inside an attribute value could cause markup in that value, which the sanitizer left inert, to be emitted as live elements in the helper's html_safe output, possibly leading to XSS. Applications that use the HTML5 sanitizer and pass untrusted text to highlight, or to simple_format with html_options, are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.","publishedAt":"2026-11-10T21:02:30.667Z","updatedAt":"2026-11-10T21:02:30.667Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/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":"< 8.0.5.2","status":"affected"},{"version":">= 8.1, < 8.1.4.1","status":"affected"}]}],"references":["https://github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc","https://github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11","https://github.com/rails/rails/releases/tag/v8.0.5.2","https://github.com/rails/rails/releases/tag/v8.1.4.1","http://github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73"],"weaknesses":["CWE-79"],"ingestedAt":"2026-11-10T21:16:04.848Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/126xxx/CVE-2026-126079.json","commit":"c5a01f083f4f1bb59d77be7743a509cc9f9b04ca","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-126079","state":"PUBLISHED","datePublished":"2026-11-10T21:02:30.667Z","dateUpdated":"2026-11-10T21:02:30.667Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-11-10T17:07:43.285Z"},"containers":{"cna":{"title":"Action View: Possible XSS vulnerability in Action View text 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, with the HTML5 sanitizer (Rails::HTML5::Sanitizer, the default vendor on CRuby for applications using load_defaults 7.1 or later), Nokogiri before 1.19.5 serializes < and > unescaped inside attribute values. The Action View text helpers highlight and simple_format sanitize their input and then process the resulting HTML as a string: highlight splits it on tag boundaries to insert matches, and simple_format splits it into paragraphs on blank lines. An unescaped > or a blank line inside an attribute value could cause markup in that value, which the sanitizer left inert, to be emitted as live elements in the helper's html_safe output, possibly leading to XSS. Applications that use the HTML5 sanitizer and pass untrusted text to highlight, or to simple_format with html_options, are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2."}],"affected":[{"vendor":"rails","product":"rails","versions":[{"version":"< 8.0.5.2","status":"affected"},{"version":">= 8.1, < 8.1.4.1","status":"affected"}]}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc","name":"https://github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11","name":"https://github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11","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"]},{"url":"http://github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73","name":"http://github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/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":"2026-11-10T21:02:30.667Z"},"source":{"advisory":"GHSA-2p2f-4rq4-gjwc","discovery":"UNKNOWN"}}}}}