CVE-2021-41246: AUTH0 Express Openid Connect

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• AUTH0 Express Openid Connect: from 2.3.0, before 2.5.2 (fixed in 2.5.2)

Published 2021-12-09. Last modified 2026-06-17.