High 7.7Published Mar 27, 2026

CVE-2026-24031Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin.

Updated under an hour ago (Oct 26, 2026, 8:40 PM ET)

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It affects Open-Xchange GmbH OX Dovecot Pro and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Open-Xchange GmbH OX Dovecot Pro

Exploited in the last 30 days

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.

CVSS: 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness (CWE): CWE-89
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: OX
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Open-Xchange GmbH OX Dovecot Pro open_xchange:ox_dovecot_pro (from the name)	through 3.1.0; through 2.4.0	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
dovecot dovecot dovecot:dovecot	before 2.4.3	NVD
open-xchange dovecot open-xchange:dovecot	before 3.1.4	NVD

References

References

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json	vendor-advisory
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.