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.
Scores
CVSS v3
3.7
EPSS
0.0002
EPSS Percentile
6.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-90
Status
published
Products (4)
dovecot/dovecot
< 2.4.3
open-xchange/dovecot
< 3.1.4
Open-Xchange GmbH/OX Dovecot Pro
< 2.4.0
Open-Xchange GmbH/OX Dovecot Pro
< 3.1.0
Published
Mar 27, 2026
Tracked Since
Mar 27, 2026