CVE-2026-40020
4.3
MEDIUM
CVSS 3.1
EPSS 0.27%
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.
How to fix CVE-2026-40020
To remediate CVE-2026-40020, upgrade the affected package to a fixed version below.
- —upgrade to 1:2.3.13+dfsg1-2+deb11u4 or later
Is CVE-2026-40020 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1:2.3.13+dfsg1-2+deb11u4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |