Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Open-Xchange GmbH / OX Dovecot Pro | affected 0 through 3.1.0; affected 0 through 2.4.0 |
CWE
CWE-89
References
- https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in Dovecot. When the `auth_username_chars` configuration is cleared by an administrator, it creates an authentication bypass vulnerability. This allows a remote attacker to gain unauthorized access to user accounts and enumerate valid usernames.