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CVE-2026-27860

5.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · dovecot, open-xchangeNVD modified 2026-10-26 00:10

Affected (CPE criteria) 2

  • cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
  • cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*

References 1