{"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":"# Overview\n\nIn versions <=8.5.1 of jsonwebtoken library, lack of algorithm definition and a falsy secret or key in the `jwt.verify()` function can lead to signature validation bypass due to defaulting to the `none` algorithm for signature verification.\n\n# Am I affected?\nYou will be affected if all the following are true in the `jwt.verify()` function:\n- a token with no signature is received\n- no algorithms are specified \n- a falsy (e.g. null, false, undefined) secret or key is passed \n\n# How do I fix it?\n \nUpdate to version 9.0.0 which removes the default support for the none algorithm in the `jwt.verify()` method. \n\n# Will the fix impact my users?\n\nThere 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":"2026-10-28T02:31:08.201523679Z","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"},{"type":"PACKAGE","url":"https://github.com/auth0/node-jsonwebtoken"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20240621-0007"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:08.201523679Z"}}