Description
Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
Scores
CVSS v3
7.7
EPSS
0.0003
EPSS Percentile
10.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-89
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