{"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-2026-45066"],"ecosystem":"Packagist","epss":0.00338,"exploited":false,"fixed_versions":["6.4.40","7.4.12","8.0.12"],"ghsa_id":"GHSA-qc95-4862-92fh","id":"tcs_01M5KF772MWH2WDV4QR4ESKGRR","modified_at":"2026-09-10T03:50:47.394247065Z","published_at":"2026-05-27T20:13:04Z","references":["https://osv.dev/vulnerability/GHSA-qc95-4862-92fh","https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/html-sanitizer/CVE-2026-45066.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45066.yaml","https://github.com/symfony/symfony","https://symfony.com/cve-2026-45066"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-qc95-4862-92fh#Packagist/symfony/symfony","url":"https://osv.dev/vulnerability/GHSA-qc95-4862-92fh"}],"summary":"Symfony has an HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification"}