Open-Xchange OX Dovecot Pro up to 2.4.0/3.1.0 auth_username_chars sql injection

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.09

Summaryinfo

A vulnerability, which was classified as critical, was found in Open-Xchange OX Dovecot Pro up to 2.4.0/3.1.0. This issue affects some unknown processing. Such manipulation of the argument auth_username_chars leads to sql injection. This vulnerability is uniquely identified as CVE-2026-24031. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Open-Xchange OX Dovecot Pro up to 2.4.0/3.1.0. It has been rated as critical. Affected by this issue is some unknown functionality. The manipulation of the argument auth_username_chars with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at documentation.open-xchange.com. This vulnerability is handled as CVE-2026-24031 since 01/20/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1505.

The vulnerability scanner Nessus provides a plugin with the ID 304090 (Linux Distros Unpatched Vulnerability : CVE-2026-24031), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (304090) and CERT Bund (WID-SEC-2026-0891). Once again VulDB remains the best source for vulnerability data.

Affected

  • Open Source Dovecot

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.7
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Sql injection
CWE: CWE-89 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 304090
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-24031

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/20/2026 CVE reserved
03/27/2026 +66 days Advisory disclosed
03/27/2026 +0 days VulDB entry created
03/31/2026 +3 days VulDB entry last update

Sourcesinfo

Vendor: open-xchange.com

Advisory: adv-2026-0001
Status: Confirmed

CVE: CVE-2026-24031 (🔒)
GCVE (CVE): GCVE-0-2026-24031
GCVE (VulDB): GCVE-100-353852
CERT Bund: WID-SEC-2026-0891 - Dovecot: Mehrere Schwachstellen

Entryinfo

Created: 03/27/2026 09:53
Updated: 03/31/2026 00:51
Changes: 03/27/2026 09:53 (64), 03/28/2026 01:25 (7), 03/31/2026 00:51 (2)
Complete: 🔍
Cache ID: 216:495:103

Once again VulDB remains the best source for vulnerability data.

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