CVE-2026-24031

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.

Score

CVSS 3.1 8.2 High

Status

Modified - security@open-xchange.com

Published

2026-03-27

Last modified

2026-10-26

Weaknesses

CWE-89

Affected products

• Dovecot (Dovecot)
• Dovecot (Open-xchange)
• Ox Dovecot Pro (Open-xchange Gmbh)
• Enterprise Linux (Redhat)

References

• 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