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Advisory severityUnratedApache Software Foundation Updated

Advisory [CVE-2026-49939] 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 Apache Software Foundation security advisory covers CVE-2026-49939; related products: Apache James.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-49939 Source published Source updated

VulniPulse record published Record updated

CVE-2026-49939
Related products & platforms
Apache Software FoundationUnclassified
Open source advisory

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.

Is CVE-2026-49939 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-49939 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-49939?

Upgrade to a fixed release named by Apache:

  • 3.9.1

Confirm against the vendor advisory before you patch.

Affected versions
  • Apache James 3.9.0 before 3.9.1

Official advisory · medium-confidence parse· fetched 8 hours ago·verify at source

Fixed versions
  • 3.9.1

Official advisory · medium-confidence parse· fetched 8 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Users are recommended to upgrade to version 3.9.1 which fixes this issue.

Official advisory · medium-confidence parse· fetched 8 hours ago·verify at source

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