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Vulnerability DatabaseCVE-2026-27860

CVE-2026-27860: 
Dovecot vulnerability analysis and mitigation

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.

Source: NVD

Related Dovecot vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-27858HIGH7.5
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026
CVE-2026-27856HIGH7.4
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026
CVE-2026-27859MEDIUM5.3
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026
CVE-2026-27857MEDIUM4.3
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026
CVE-2026-27860LOW3.7
  • DovecotDovecot
  • dovecot-mysql
NoYesMar 27, 2026

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