Bug 2452176 (CVE-2026-27860) - CVE-2026-27860 dovecot: Dovecot: Authentication bypass and information disclosure via LDAP filter injection
Summary: CVE-2026-27860 dovecot: Dovecot: Authentication bypass and information disclo...
Keywords:
Status: NEW
Alias: CVE-2026-27860
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 09:02 UTC by OSIDB Bzimport
Modified: 2026-03-27 14:56 UTC (History)
0 users

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Description OSIDB Bzimport 2026-03-27 09:02:13 UTC 
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.
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