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Review reviewHigh

CVE-2026-24031

Open-Xchange GmbH OX Dovecot Pro, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

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
8.2
EPSS
0.40%
32.3% percentile
CISA KEV
Not listed
Published
2026.03.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.40%
Technical severityCVSS 8.2

Vulnerability overview

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 product and versions

Product
Open-Xchange GmbH OX Dovecot Pro, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions
<= 3.1.0, <= 2.4.0, < 2.4.3, < 3.1.4
Fixed versions
2.4.3, 3.1.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Open-Xchange GmbH OX Dovecot Pro, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
CWE
CWE-89