CVE-2026-40020

Description

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.

PUBLISHED Reserved 2026-04-08 | Published 2026-05-12 | Updated 2026-05-12 | Assigner OX

Problem types

Improper Access Control

Product status

References

documentation.open-xchange.com/...26/oxdc-adv-2026-0002.json vendor-advisory

cve.org (CVE-2026-40020)

nvd.nist.gov (CVE-2026-40020)

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