# CVE-2026-19601: Mattermost AD/LDAP bind password exposure in system configuration

Source: https://junglewise.ai/threats/cve-2026-19601-mattermost-versions-11-9-x-11-9-1-11-8-x-11-8-5-11-7-x-11-7-10-11  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-16. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-19601 · Severity: medium · CVSS 4.9 · Published 2026-10-16

Mattermost, a team communication platform, stores AD/LDAP directory passwords to authenticate with enterprise directory services. When a system administrator changes connection settings such as the server address, the software fails to clear the old password from storage. An attacker with system console access can then redirect the connection to a malicious server and retrieve the plaintext password via the Test Connection feature.

Technologies: [Mattermost Server](https://junglewise.ai/threats/technologies/server-public). Vendors: [Mattermost](https://junglewise.ai/threats/vendors/mattermost).

## Quick answers

**Is CVE-2026-19601 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19601 being exploited in the wild.

**How severe is CVE-2026-19601?** Medium severity, with a CVSS score of 4.9, published 16 October 2026.

**Which products and versions are affected?** Mattermost Server 11.7.0-11.7.10, 11.8.0-11.8.5, 11.9.0-11.9.1, 11.10.0-11.10.1.

**Is there a fix for CVE-2026-19601?** Yes: fixed in Mattermost Server 11.7.11, 11.8.6, 11.9.2, 11.10.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-19601 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-19601?** Check whether you run Mattermost Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Mattermost Server 11.7.11, 11.8.6, 11.9.2, 11.10.2

## Technical details

The vulnerability is a credential exposure flaw in Mattermost's AD/LDAP configuration handling. When connection parameters are modified but the bind password is not explicitly changed, the old plaintext password remains cached and can be disclosed to an attacker-controlled LDAP server when the administrator tests the connection. This requires system console administrator privileges and user interaction (initiating a test connection).

## Affected products

- Mattermost Mattermost Server 11.7.0-11.7.10, 11.8.0-11.8.5, 11.9.0-11.9.1, 11.10.0-11.10.1

## Timeline

- 2026-10-16: disclosed

## References

- [https://mattermost.com/security-updates](https://mattermost.com/security-updates)

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