CVE-2021-41246Session fixation in express-openid-connect
- 4.6MediumCVSS base score
- 0.92%Exploitation in 30 daysEPSS · top 39% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By GitHub_M
- 3 months later
· 3 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium4.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.92% · top 39% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.6.
Affected products
auth0 · express-openid-connect
- affected >= 2.3.0, < 2.5.2
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmexpress-openid-connectGHSA-7rg2-qxmf-hhx9 (opens in a new tab)
References
References3
- https://github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430f (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-2474 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-7rg2-qxmf-hhx9 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-41246)Record last updated .