CVE-2025-66621 json
Apache James: SASL OAUTHBEARER do not validate aud in JWT payload if misconfigred
published 2026-11-06 3 d ago modified 2026-11-06 2 d ago also EUVD-2025-211271
- cvss
- —
- not scored
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Apache Software Foundation Apache James 3.9.1
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
Affected products
- Apache Software Foundation Apache James
Classification
- Weakness
-
- CWE-345 Insufficient Verification of Data Authenticity
References
Sources
- CVE List CVE-2025-66621
- NVD CVE-2025-66621
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.