CVE-2026-49939

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

Published Nov 6, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Type Values Removed Values Added
First Time appeared Apache
Apache james
Vendors & Products Apache
Apache james
Type Values Removed Values Added
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.
Title Apache James: Negative IMAP ACL administer authorization bypass through JMAP protocol
Weaknesses CWE-284
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Nov 10, 2026, 6:46 PM
Reserved
Jun 2, 2026, 3:37 PM
Status
Deferred
Published
Nov 6, 2026, 12:17 PM
Modified
Nov 10, 2026, 7:21 PM