CVE-2021-41246
CVE-2021-41246 is a medium-severity vulnerability in Auth0 Express Openid Connect with a CVSS 3.x base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-384.
Key facts
- Severity: Medium (CVSS 3.x base score 4.6)
- CVSS v2: 6.8
- EPSS exploit prediction: 1% (55th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-384
- Affected product: Auth0 Express Openid Connect
- Published:
- Last 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.
Frequently asked questions
- What is CVE-2021-41246?
- 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.
- How severe is CVE-2021-41246?
- CVE-2021-41246 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-41246 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-41246?
- CVE-2021-41246 affects Auth0 Express Openid Connect. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-41246?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-41246 published?
- CVE-2021-41246 was published on 2021-12-09 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:auth0:express_openid_connect:*:*:*:*:*:node.js:*:*
More vulnerabilities in Auth0 Express Openid Connect
- CVE-2022-24794 — High (CVSS 7.5): Express OpenID Connect is an Express JS middleware implementing sign on for Express web apps using OpenID Connect.…
All CVEs affecting Auth0 Express Openid Connect →
Other CWE-384 (Session Fixation) vulnerabilities
- CVE-2024-11317 — Critical (CVSS 10.0): Session Fixation vulnerabilities allow an attacker to fix a users session identifier before login providing an…
- CVE-2024-38513 — Critical (CVSS 10.0): Fiber is an Express-inspired web framework written in Go A vulnerability present in versions prior to 2.52.5 is a…
- CVE-2021-20151 — Critical (CVSS 10.0): Trendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's…
- CVE-2025-67446 — Critical (CVSS 9.8): Improper Authentication (Authentication Bypass) exists in Neterbit NW-431F Router 20241014-IR03 and before. The router…
- CVE-2026-25101 — Critical (CVSS 9.8): Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same…
- CVE-2026-24352 — Critical (CVSS 9.8): PluXml CMS allows a user's session identifier to be set before authentication. The value of this session ID stays the…