CVE-2021-41246
Session fixation in express-openid-connect
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Session fixation in express-openid-connect
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.
- Record
CVE-2021-41246- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-384
- Updated
- 2026-11-02
EUVDEUVD-2021-2474
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.
- Record
EUVD-2021-2474- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7rg2-qxmf-hhx9
Session fixation in express-openid-connect
Overview
Versions 2.3.0 up to 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.
Am I affected?
You are affected by this vulnerability if you are using express-openid-connect version 2.3.0 up to and including 2.5.1 and use a custom session store.
How to fix that?
Upgrade to version >= 2.5.2.
Will this update impact my users?
The fix provided in patch will not affect your users.
- Record
GHSA-7rg2-qxmf-hhx9- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-384
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-41246- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-384
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-41246- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-7rg2-qxmf-hhx9
Session fixation in express-openid-connect
Overview
Versions 2.3.0 up to 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.
Am I affected?
You are affected by this vulnerability if you are using express-openid-connect version 2.3.0 up to and including 2.5.1 and use a custom session store.
How to fix that?
Upgrade to version >= 2.5.2.
Will this update impact my users?
The fix provided in patch will not affect your users.
- Record
GHSA-7rg2-qxmf-hhx9- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-384
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
express-openid-connectnpm |
2.3.0 up to 2.5.2 | 2.5.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-41246 is a medium vulnerability (CVSS 4.6) in Auth0 Express-openid-connect, published December 9, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.92%, the 60th percentile. Fixed in express-openid-connect 2.5.2.
References
github.com/auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9
nvd.nist.gov/vuln/detail/CVE-2021-41246