CVE-2026-49939

EUVD-2026-118216
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
apacheCNA
UNKNOWN
---
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
apachejames
3.9.0 ≤
𝑥
< 3.9.1
CNA
Common Weakness Enumeration
References
https://lists.apache.org/thread.html/7qwsmkk88xbfq4q9o0pz9bt8p9p1yjs7
http://www.openwall.com/lists/oss-security/2026/11/06/14