{"id":"CVE-2023-51774","aliases":["GHSA-c8v6-786g-vjx6"],"url":"https://o3.security/vulnerability/CVE-2023-51774","summary":"json-jwt allows bypass of identity checks via a sign/encryption confusion attack","details":"The json-jwt (aka JSON::JWT) gem 1.16.x before 1.16.6, 1.15.x before 1.15.3.1 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.","published":"2023-12-25T00:00:00Z","modified":"2026-08-12T03:51:28.402350801Z","cvss":{"score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"json-jwt","fixedVersion":"1.16.6"},{"ecosystem":"RubyGems","name":"json-jwt","fixedVersion":"1.15.3.1"}],"fix":{"url":"https://github.com/nov/json-jwt/commit/593ea8bcaf2629048bad8c036191f2da0a2e713c","label":"nov/json-jwt@593ea8b"},"references":[{"type":"WEB","url":"https://github.com/P3ngu1nW/CVE_Request/blob/main/novjson-jwt.md"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/51xxx/CVE-2023-51774.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-51774"},{"type":"WEB","url":"https://github.com/nov/json-jwt/issues/120"},{"type":"WEB","url":"https://github.com/nov/json-jwt/issues/121"},{"type":"WEB","url":"https://github.com/nov/json-jwt/commit/593ea8bcaf2629048bad8c036191f2da0a2e713c"},{"type":"WEB","url":"https://github.com/nov/json-jwt/commit/9c4d842a9465bd7960570ca326c3de79b4abc9d0"},{"type":"PACKAGE","url":"https://github.com/nov/json-jwt"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/json-jwt/CVE-2023-51774.yml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.402350801Z"}}