{"id":"CVE-2026-126079","published":"2026-11-10T21:19:26.513","lastModified":"2026-11-10T21:19:26.513","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.","cvssScore":6.1,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"http://github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73","tags":[]},{"url":"https://github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":[]},{"url":"https://github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc","tags":[]}],"exploitRefs":[{"url":"http://github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73","tags":[]},{"url":"https://github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.2","tags":[]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.4.1","tags":[]},{"url":"https://github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc","tags":[]}],"hasPoc":true,"ai":null}