PT-2026-40028 · Dovecot · Dovecot

Published 2026-05-12 · Updated 2026-06-02 · CVE-2026-40020

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.4-1.1

Description An attacker can use the IMAP SETACL command to inject the anyone permission into a user's dovecot-acl file, bypassing the imap acl allow anyone=no configuration. This allows folders to be spammed to all users, although no unauthorized access to data is granted.

Recommendations Update to version 2.4.4-1.1.

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-40020

OPENSUSE-SU-2026:10766-1

USN-8365-1

Affected Products

Dovecot

References · 21

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-40020 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-40020 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8365-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40020 · Security Note
• https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-40020 · Security Note
• https://ubuntu.com/security/CVE-2026-33603 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42006 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10766-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8365-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-40016 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-40020 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27851 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-40020 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-42006 · Note