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% (59th 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.

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% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-384
Affected product: Auth0 Express Openid Connect
Published: 2021-12-09
Last modified: 2026-06-17

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% (59th 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

Affected products (1)

cpe:2.3:a:auth0:express_openid_connect:*:*:*:*:*:node.js:*:*

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