CVE-2026-49939 json
Apache James: Negative IMAP ACL administer authorization bypass through JMAP protocol
published 2026-11-06 3 d ago modified 2026-11-06 2 d ago also EUVD-2026-118216
- cvss
- —
- not scored
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
Summary
In Apache James server prior version 3.9.1 improper Access Control List processing is exposed by the JMAP protocol which do not account for negative rules positionned by IMAP protocol.
This results in users being able to administer folders in JMAP despite having being explicitly denied the right to do so in IMAP.
Users are recommended to upgrade to version 3.9.1 which fixes this issue.
Patch / fix
- Apache Software Foundation Apache James 3.9.1
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).
Affected products
- Apache Software Foundation Apache James
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
Sources
- CVE List CVE-2026-49939
- NVD CVE-2026-49939
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