Mattermost Desktop App 6.2.2.0 Local Pre-Auth Secret Leak via Diagnostics Report
CVE-2026-75587 Published on August 17, 2026
Plaintext pre-auth secret exposure via Desktop App diagnostics report
Mattermost Desktop App versions <=6.2 6.2.2.0 fail to redact the pre-auth secret when generating a diagnostics report, which allows a local attacker with access to a user's diagnostics report or log files to obtain the plaintext pre-auth secret configured for a connected server via inspecting the Server Connectivity (Step-3) diagnostics output. Mattermost Advisory ID: MMSA-2026-00716
Vulnerability Analysis
CVE-2026-75587 can be exploited with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-75587 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-75587
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Affected Versions
Mattermost:- Before and including 6.2.2 is affected.
- Version 6.3.0 is unaffected.
- Version 6.2.3.0 is unaffected.