{"action":"Upgrade symfony/symfony to 7.4.12 or later.","affected":[{"fixed":"7.4.12","introduced":"7.2.0"},{"fixed":"8.0.12","introduced":"8.0.0"}],"component":"symfony/symfony","cve_ids":["CVE-2026-45755"],"ecosystem":"Packagist","epss":0.00267,"exploited":false,"fixed_versions":["7.4.12","8.0.12"],"ghsa_id":"GHSA-59f3-vp2f-mp9w","id":"tcs_01M5KEVWCNXWD8Y9YKG4620QH0","modified_at":"2026-09-10T03:50:45.630958598Z","published_at":"2026-05-28T17:33:47Z","references":["https://osv.dev/vulnerability/GHSA-59f3-vp2f-mp9w","https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9w","https://github.com/symfony/symfony/commit/4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailtrap-mailer/CVE-2026-45755.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45755.yaml","https://github.com/symfony/symfony","https://symfony.com/cve-2026-45755"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-59f3-vp2f-mp9w#Packagist/symfony/symfony","url":"https://osv.dev/vulnerability/GHSA-59f3-vp2f-mp9w"},{"source":"nvd","source_id":"CVE-2026-45755","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45755"}],"summary":"Symfony's Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection"}