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Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then...
CVE-2026-27855
Première détection SecPulse
État des correctifs par distribution
Paquets corrigés publiés par chaque distribution pour cette CVE
- Alpine Linux ALPINE-CVE-2026-27855 dovecot Corrigé dans: 2.4.3-r0
- Debian DEBIAN-CVE-2026-27855 dovecot Corrigé dans: 1:2.3.13+dfsg1-2+deb11u3
Description d'origine La description telle que publiée par la source (souvent en anglais).
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.
Références
- advisory documentation.open-xchange.com
- advisory github.com
- advisory nvd.nist.gov