Apache
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 posit
CVE-2026-49939 Nov 6, 2026 Source: Vendor
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.
Source of record
The credited names below are quoted verbatim from the vendor's own advisory:
https://nvd.nist.gov/vuln/detail/CVE-2026-49939
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CVE-2026-49939
BR2026-0000-042938
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Credited as Thanks mitchell from revampstudio.com.au for the report