Is CVE-2026-41213 in the CISA KEV catalog?

No. CVE-2026-41213 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-41213?

CVE-2026-41213 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2026-41213?

CVE-2026-41213 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-41213?

Upgrade node-oauth\/oauth2-server to 5.3.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-41213

MEDIUM

5.9

CVSS v3

NVD

Description

@node-oauth/oauth2-server is a module for implementing an OAuth2 server in Node.js. The token exchange path accepts RFC7636-invalid code_verifier values (including one-character strings) for S256 PKCE flows. Because short/weak verifiers are accepted and failed verifier attempts do not consume the authorization code, an attacker who intercepts an authorization code can brute-force code_verifier guesses online until token issuance succeeds.

CWE-307 CWE-1289

How to fix

Remediation Available

node-oauth\/oauth2-serverNVD

Affected:< 5.3.0Fixed in:5.3.0CVE-2026-41213derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Exploit1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-02.