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CVE-2026-27860

nvd nist
Published: Mar 27, 2026Modified: Jun 17, 2026

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5.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploitability: 3.9 / Impact: 1.4
Source: NVD

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.

Affected (2)

Dovecot
1 product
Dovecot
Open Xchange
1 product
Dovecot
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Dovecot
Before 2.4.3
Dovecot
Before 3.1.4

Related CWEs

CWE-90
Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

References (1)

Source: security@open-xchange.com
Vendor Advisory

Timeline

No history available yet.