{"id":"CVE-2026-45066","aliases":["GHSA-qc95-4862-92fh"],"url":"https://o3.security/vulnerability/CVE-2026-45066","summary":"Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification","details":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because <area href> is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.","published":"2026-07-14T17:53:49.836Z","modified":"2026-08-12T03:51:23.805301196Z","cvss":null,"epss":{"score":0.00298,"percentile":0.22394,"asOf":"2026-08-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/html-sanitizer","fixedVersion":"6.4.40"},{"ecosystem":"Packagist","name":"symfony/html-sanitizer","fixedVersion":"7.4.12"},{"ecosystem":"Packagist","name":"symfony/html-sanitizer","fixedVersion":"8.0.12"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"6.4.40"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"7.4.12"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"8.0.12"}],"fix":{"url":"https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4","label":"symfony/symfony@d506b55"},"references":[{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v6.4.40"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v7.4.12"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v8.0.12"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45066.json"},{"type":"ADVISORY","url":"https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45066"},{"type":"FIX","url":"https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:23.805301196Z"}}