{"id":"EUVD-2023-2883","revision":"b6fc850d3f6f49ad8b26b98ef4afb2d9","records":[{"revision":"b6fc850d3f6f49ad8b26b98ef4afb2d9","observedAt":"2026-11-04T22:00:15.838+00:00","statement":{"source":"euvd","id":"EUVD-2023-2883","aliases":["CVE-2023-48238","GHSA-4xw9-cx39-r355"],"title":"joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Versions prior to 4.0.0 are vulnerable to a JW…","description":"joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Versions prior to 4.0.0 are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application. This attack will only work against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm. Version 4.0.0 fixes the issue.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":null}],"references":["https://github.com/joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355","https://github.com/joaquimserafim/json-web-token/commit/b6e56b1346f48432d29133c76b65222ad93956b7"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-2883","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Nov 17, 2023, 9:35:00 PM","dateUpdated":"Jun 8, 2026, 11:38:16 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2023-2883","identifiers":["EUVD-2023-2883","CVE-2023-48238","GHSA-4xw9-cx39-r355"]},"retained":false,"historicalAffected":[]}],"coverage":[]}