CVE-2026-24031
High
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.
SeverityHigh
CVSS7.7
Exploit probability—
ProductDovecot
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-89SQL injection
How to fix
Update
- dovecot dovecot2.4.3 or later
- open-xchange dovecot3.1.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| dovecot dovecot | v < 2.4.3 | 2.4.3 |
| open-xchange dovecot | v < 3.1.4 | 3.1.4 |
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