CVE-2021-41246

Name: CVE-2021-41246
Creator: NVD / NIST
Published: 2021-12-09T16:15:08.383+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.89%

Last modified Jun 17, 2026

CVE-2021-41246 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.89%

54.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-384

Affected Software

Vendor	Product	Versions
Auth0	Express Openid Connect	>= 2.3.0, < 2.5.2

References

https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430fPatch, Third Party Advisory
https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2Release Notes, Third Party Advisory
https://github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9Third Party Advisory
https://github.com/auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430fPatch, Third Party Advisory
https://github.com/auth0/express-openid-connect/releases/tag/v2.5.2Release Notes, Third Party Advisory
https://github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9Third Party Advisory

Timeline

Published: Dec 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41246?

How severe is CVE-2021-41246?

CVE-2021-41246 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41246?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41246?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST