CVE-2026-19601
Medium
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
SeverityMedium
CVSS4.9
Exploit probability—
Product
Mattermost Server
PublishedOct 16, 2026
First seenOct 16, 2026
Weakness typeCWE-201CWE-201
How to fix
Update
- mattermost mattermost_server11.7.11, 11.8.6, 11.9.2, 11.10.2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 11.7.0 ≤ v < 11.7.11, 11.8.0 ≤ v < 11.8.6, 11.9.0 ≤ v < 11.9.2, 11.10.0 ≤ v < 11.10.2 | 11.7.11, 11.8.6, 11.9.2, 11.10.2 |
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