Skip to main content
CVE-2026-49939VulnerabilityPublished

In Apache James server prior version 3.9.1 improper Access Control List processing is exposed by the JMAP protocol

Source GCVE Database

0
Compare
Authoritative record:CVE-2026-49939· High

Not known to be exploited : upgrade to 3.9.1 soon.

Data as of 6 Nov 2026, 13:24 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 3.9.1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade Apache James and org.apache.james/apache-james-server to 3.9.1.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache JamesAffected
  • >=3.9.0 <3.9.1
Fixed in
  • 3.9.1
Mavenorg.apache.james/apache-james-serverpkg:maven/org.apache.james/apache-james-serverOther threatsAffected
  • >=3.9.0 <3.9.1
Fixed in
  • 3.9.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users are advised to upgrade Apache James server to version 3.9.1, which contains the official fix for this ACL processing vulnerability. No additional mitigation steps are indicated.

Description

Apache James server versions prior to 3.9.1 have an improper Access Control List (ACL) processing vulnerability in the JMAP protocol. This flaw arises because the JMAP protocol does not correctly handle negative ACL rules set by the IMAP protocol, allowing users to administer folders despite explicit denial of rights in IMAP. Upgrading to version 3.9.1 resolves this issue.

References

Community reviews

Loading reviews…