CVE-2026-27860

State: Published
Severity: 3.7 Low
Published: Mar 27, 2026
Updated: Mar 27, 2026
Reserved: Feb 24, 2026

Description

If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.

Scores

CVSS	Score	Vector	Source
3.1	3.7 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N	OX

Weaknesses

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

Affected Products

Product	Versions
OX Dovecot ProOpen-Xchange GmbH	3.1.0 and earlierAffected 2.4.0 and earlierAffected

References

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.jsonvendor-advisory

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