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CVE-2026-40020

low CVSS 3.1 EPSS 0.3%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-40020 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
Low
CVSS base score
3.1 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.3% probability of exploitation in the next 30 days, higher than 18% of scored vulnerabilities
Weakness
CWE-284
Published
2026-05-12
NVD CVE.org

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