CVE-2026-27860

dovecot: Dovecot: Authentication bypass and information disclosure via LDAP filter injection

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Severity

Low

Red Hat Product Security

3.7

CVSS 3.1

Review impact separately from score.

Published · March 27, 2026

Updated · June 30, 2026

Description

A flaw was found in Dovecot. A remote attacker could exploit this vulnerability by injecting malicious Lightweight Directory Access Protocol (LDAP) filters during the authentication process. This is possible if the auth_username_chars configuration setting is empty. Successful exploitation could allow the attacker to bypass authentication restrictions and gain unauthorized access to information about the LDAP directory structure.

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 · 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-90 · Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')