CVE-2026-19601
Received Received - Intake

Stored AD/LDAP Bind Password Disclosure in Mattermost

Publication date: 2026-10-16

Last updated on: 2026-10-16

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to invalidate the stored AD/LDAP bind password when other connection settings (such as the server address) are changed, which allows a System Console administrator to disclose the plaintext bind password to an attacker-controlled server via the Test Connection / diagnostics feature. Mattermost Advisory ID: MMSA-2026-00764

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Meta Information

Published
2026-10-16
Last Modified
2026-10-16
Generated
2026-10-16
AI Q&A
2026-10-16
EPSS Evaluated
N/A
NVD
CVE-2026-19601
EUVD
EUVD-2026-102807

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
Mattermost Mattermost 11.9.0
Mattermost Mattermost 11.8.0
Mattermost Mattermost 11.7.0
Mattermost Mattermost 11.10.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-201 The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.

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Executive Summary

Mattermost versions between 11.7.x and 11.10.x fail to clear the stored AD/LDAP bind password when connection settings like server address are modified. This allows a System Console admin to expose the plaintext bind password via the Test Connection feature to an attacker-controlled server.

Detection Guidance

Check Mattermost server logs for suspicious Test Connection requests to unauthorized LDAP/AD servers. Review System Console audit logs for changes to LDAP/AD connection settings. Inspect network traffic from Mattermost servers to unexpected external LDAP/AD endpoints.

Impact Analysis

An attacker could gain access to the plaintext AD/LDAP bind password, potentially allowing unauthorized access to directory services or user authentication systems if the password is reused or has sufficient privileges.

Mitigation Strategies

Upgrade Mattermost to a patched version (11.7.11, 11.8.6, 11.9.2, or 11.10.2). Rotate all LDAP/AD bind passwords immediately after upgrade. Disable the Test Connection feature if not required. Monitor for unauthorized LDAP/AD server connections.

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