high7.7
CVE-2026-24031
Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin.
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Dovecot | Dovecot | before 2.4.3 |
| Open-Xchange | Dovecot | before 3.1.4 |
Weakness classification
References
- NVD record
- CVE.org record
- https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
- https://access.redhat.com/security/cve/CVE-2026-24031
- https://bugzilla.redhat.com/show_bug.cgi?id=2452181
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24031.json