{"id":"CVE-2022-23540","aliases":["GHSA-qwph-4952-7xr6"],"url":"https://o3.security/vulnerability/CVE-2022-23540","summary":"jsonwebtoken vulnerable to signature validation bypass due to insecure default algorithm in jwt.verify()","details":"In versions `<=8.5.1` of `jsonwebtoken` library, lack of algorithm definition in the `jwt.verify()` function can lead to signature validation bypass due to defaulting to the `none` algorithm for signature verification. Users are affected if you do not specify algorithms in the `jwt.verify()` function. This issue has been fixed, please update to version 9.0.0 which removes the default support for the none algorithm in the `jwt.verify()` method. There will be no impact, if you update to version 9.0.0 and you don’t need to allow for the `none` algorithm. If you need 'none' algorithm, you have to explicitly specify that in `jwt.verify()` options.","published":"2022-12-22T18:02:24.770Z","modified":"2026-08-12T03:51:35.754129917Z","cvss":{"score":6.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"jsonwebtoken","fixedVersion":"9.0.0"}],"fix":{"url":"https://github.com/auth0/node-jsonwebtoken/commit/e1fa9dcc12054a8681db4e6373da1b30cf7016e3","label":"auth0/node-jsonwebtoken@e1fa9dc"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/23xxx/CVE-2022-23540.json"},{"type":"ADVISORY","url":"https://github.com/auth0/node-jsonwebtoken/security/advisories/GHSA-qwph-4952-7xr6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-23540"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240621-0007/"},{"type":"FIX","url":"https://github.com/auth0/node-jsonwebtoken/commit/e1fa9dcc12054a8681db4e6373da1b30cf7016e3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:35.754129917Z"}}