{"cve":"CVE-2021-41246","nvd":{"published":"2021-12-09T16:15:08.383","modified":"2026-06-17T04:08:10.090","status":"Modified","description":"Express OpenID Connect is express JS middleware implementing sign on for Express web apps using OpenID Connect. Versions before and including `2.5.1` do not regenerate the session id and session cookie when user logs in. This behavior opens up the application to various session fixation vulnerabilities. Versions `2.5.2` contains a patch for this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-384"],"references":["https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430f","https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2","https://github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9","https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430f","https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2"],"products":["auth0:express_openid_connect"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-41246","score":0.00924,"percentile":0.60417,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7rg2-qxmf-hhx9","url":"https://osv.dev/vulnerability/GHSA-7rg2-qxmf-hhx9","summary":"Session fixation in express-openid-connect","modified":"2026-07-08T06:28:35.377920672Z","packages":[{"ecosystem":"npm","name":"express-openid-connect","purl":"pkg:npm/express-openid-connect","ranges":[">=2.3.0 <2.5.2"],"fixed":["2.5.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}