#VU124730 Improper Authentication in Dovecot and OX Dovecot Pro - CVE-2026-27856

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Main Vulnerability Database Vulnerabilities #VU124730

#VU124730 Improper Authentication in Dovecot and OX Dovecot Pro - CVE-2026-27856

Published: April 1, 2026 / Updated: April 1, 2026


Vulnerability identifier: #VU124730
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-27856
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Dovecot
OX Dovecot Pro
Software vendor:
Dovecot

Description

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to improper authentication in doveadm credentials verification when comparing provided credentials. A remote attacker can perform timing oracle attack to bypass authentication.


Remediation

Install security update from vendor's website.

External links