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High · 7.5 CVE-2026-49939 EUVD-2026-118216GHSA-84j6-j2xp-crm8

Apache James: Negative IMAP ACL administer authorization bypass through JMAP protocol

Published Nov 6, 2026 · Updated Nov 10, 2026 · Assigned by apache

Description

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.

Affected products

VendorProductAffectedFixed
Apache Software Foundation Apache James 3.9.0 – < 3.9.1 3.9.1

References