Is there a public exploit for CVE-2025-66621?

No public exploit for CVE-2025-66621 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

What does CVE-2025-66621 affect?

CVE-2025-66621 affects Apache Software Foundation Apache James.

— Unscored

Apache James SASL OAuthBearer/XOAUTH2 prior versions 3.9.1 fails to validate correctly AUD claim of JWT payloads when introspection is not…

CVE-2025-66621

Apache James SASL OAuthBearer/XOAUTH2 prior versions 3.9.1 fails to validate correctly AUD claim of JWT payloads when introspection is not configured. This allows an attacker with valid credentials to access the mail server even if they are not authorized to do so. We recommend users to upgrade to non vulnerable version that forces explicit configuration of aud claims and forces introspection.

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 6 November 2026
Last updated: 6 November 2026
Affected: Apache Software Foundation · Apache James
Assigner: apache

At the source

EUVD (ENISA)

References

https://lists.apache.org/thread.html/xz1g0blzcbxod69oktyq84h7t06xzov6

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