Name: CVE-2026-27860: Improper Neutralization of Special Elements used in an LDAP Query
Creator: Rapid7
Published: 2026-03-27T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-27860, CVSS 3.7, EPSS 0.00343

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.

CVSS Details

CVSS 3.1 Base Score: 3.7
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade dovecot	Mar 30, 2026	Mar 27, 2026
Debian	—	Upgrade dovecot	Jul 23, 2026	Jul 23, 2026
Redhat_linux	—	No solution exists	Jul 17, 2026	Mar 27, 2026
Ubuntu	—	Upgrade dovecot-core	Apr 1, 2026	Mar 31, 2026

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CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence