{"id":"CVE-2025-53548","aliases":["GHSA-9mp4-77wg-rwx9"],"url":"https://o3.security/vulnerability/CVE-2025-53548","summary":"@clerk/backend Performs Insufficient Verification of Data Authenticity","details":"Clerk helps developers build user management. Applications that use the verifyWebhook() helper to verify incoming Clerk webhooks are susceptible to accepting improperly signed webhook events. The issue was resolved in @clerk/backend 2.4.0.","published":"2025-07-09T17:12:10.483Z","modified":"2026-08-12T03:51:21.821021026Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@clerk/backend","fixedVersion":"2.4.0"},{"ecosystem":"npm","name":"@clerk/astro","fixedVersion":"2.10.2"},{"ecosystem":"npm","name":"@clerk/express","fixedVersion":"1.7.4"},{"ecosystem":"npm","name":"@clerk/fastify","fixedVersion":"2.4.4"},{"ecosystem":"npm","name":"@clerk/nextjs","fixedVersion":"6.23.3"},{"ecosystem":"npm","name":"@clerk/nuxt","fixedVersion":"1.7.5"},{"ecosystem":"npm","name":"@clerk/react-router","fixedVersion":"1.6.4"},{"ecosystem":"npm","name":"@clerk/remix","fixedVersion":"4.8.5"},{"ecosystem":"npm","name":"@clerk/tanstack-react-start","fixedVersion":"0.18.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53548.json"},{"type":"ADVISORY","url":"https://github.com/clerk/javascript/security/advisories/GHSA-9mp4-77wg-rwx9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53548"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:21.821021026Z"}}