{"action":"Upgrade symfony/symfony to 6.4.40 or later.","affected":[{"fixed":"6.4.40","introduced":"6.1.0"},{"fixed":"7.4.12","introduced":"7.0.0"},{"fixed":"8.0.12","introduced":"8.0.0"}],"component":"symfony/symfony","cve_ids":["CVE-2026-45753"],"ecosystem":"Packagist","epss":0.00338,"exploited":false,"fixed_versions":["6.4.40","7.4.12","8.0.12"],"ghsa_id":"GHSA-hhg7-c65m-h7ff","id":"tcs_01M5KF3P7NXE3B1N02WTF9F87W","modified_at":"2026-09-10T03:51:06.023129963Z","published_at":"2026-05-28T16:43:27Z","references":["https://osv.dev/vulnerability/GHSA-hhg7-c65m-h7ff","https://github.com/symfony/symfony/security/advisories/GHSA-hhg7-c65m-h7ff","https://github.com/symfony/symfony/commit/26a598fcfc4f903cc55ff202f642ee621839825e","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/html-sanitizer/CVE-2026-45753.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45753.yaml","https://github.com/symfony/symfony","https://symfony.com/cve-2026-45753"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-hhg7-c65m-h7ff#Packagist/symfony/symfony","url":"https://osv.dev/vulnerability/GHSA-hhg7-c65m-h7ff"},{"source":"nvd","source_id":"CVE-2026-45753","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45753"}],"summary":"Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)"}