CVE-2026-19601 Disclosure of AD/LDAP bind password via Test Connection
A system administrator can inadvertently disclose plaintext LDAP bind passwords to an attacker-controlled server via the Test Connection feature.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19601?
CVE-2026-19601 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 16 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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
Weakness: CWE-201
Which versions are affected by CVE-2026-19601?
It affects 1 product.
Products include Mattermost Mattermost Server.
How do I fix CVE-2026-19601?
No fix has been published for CVE-2026-19601 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-19601 being exploited?
There is no known exploitation of CVE-2026-19601 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as GHSA-hqj7-4xc2-7mc7.