{"id":"CVE-2026-55877","aliases":["GHSA-6v8j-33hc-mv84"],"url":"https://o3.security/vulnerability/CVE-2026-55877","summary":"Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses","details":"Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux_icon() Twig function is marked is_safe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested script elements, on* event handlers, or dangerous URL schemes to execute cross-site scripting. This issue is fixed in versions 2.36.1 and 3.2.0.","published":"2026-07-08T21:32:37.407Z","modified":"2026-08-21T03:46:54.624205101Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00338,"percentile":0.26883,"asOf":"2026-09-13"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/ux-icons","fixedVersion":"2.36.1"},{"ecosystem":"Packagist","name":"symfony/ux-icons","fixedVersion":"3.2.0"}],"fix":{"url":"https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1","label":"symfony/ux@3a4964e"},"references":[{"type":"WEB","url":"https://github.com/symfony/ux/releases/tag/v2.36.1"},{"type":"WEB","url":"https://github.com/symfony/ux/releases/tag/v3.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55877.json"},{"type":"ADVISORY","url":"https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55877"},{"type":"FIX","url":"https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T03:46:54.624205101Z"}}