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CVE-2026-27855

medium CVSS 6.8 EPSS 0.3%

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.

Versions it affects

Software versions checked with the free lookup that CVE-2026-27855 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
Medium
CVSS base score
6.8 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 24% of scored vulnerabilities
Weakness
CWE-294
Published
2026-03-27
NVD CVE.org

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