CVE-2026-24031

dovecot: Dovecot: Authentication bypass and user enumeration due to cleared auth_username_chars configuration

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Severity

Important

Red Hat Product Security

7.7

CVSS 3.1

Review impact separately from score.

Published · March 27, 2026

Updated · June 30, 2026

Description

A flaw was found in Dovecot. When the auth_username_chars configuration is cleared by an administrator, it creates an authentication bypass vulnerability. This allows a remote attacker to gain unauthorized access to user accounts and enumerate valid usernames.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')