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CVE-2021-41246

27
FAUCET Score

CVE-2021-41246 affects Auth0's Express OpenID Connect middleware versions up to 2.5.1, allowing session fixation due to the failure to regenerate session IDs and cookies upon user login. This vulnerability carries a high CVSS score of 8.8, indicating a critical risk with a network-based attack vector, low attack complexity, and high potential impact on confidentiality, integrity, and availability. While no active exploitation, public exploit code, or significant community discussion has been observed, the underlying CWE-384 (Session Fixation) is a well-understood attack class.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.3.0, < 2.5.2CPE matchmatch criteria
cpe:2.3:a:auth0:express_openid_connect:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

4.6MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.89%
Probability of exploitation in next 30 days
EPSS Percentile
55.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0089 is in the 57th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: express-openid-connectFixed in: 2.5.2

Vendor Advisories (1)

npmGHSA-7rg2-qxmf-hhx9medium

Session fixation in express-openid-connect

Dec 9, 2021

References

github.com / auth0/express-openid-connect/commit/5ab67ff2bd84f76674066b5e129b43ab5f2f430f
PatchThird Party Advisory
github.com / auth0/express-openid-connect/releases/tag/v2.5.2
Release NotesThird Party Advisory
github.com / auth0/express-openid-connect/security/advisories/GHSA-7rg2-qxmf-hhx9
Third Party Advisory