CVE-2026-75587: Mattermost Desktop

Low severity, CVSS 3.3. EPSS: 0.1% chance of exploitation in the next 30 days.

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

Affected products

• Mattermost Mattermost Desktop: before 6.2.3 (fixed in 6.2.3)

Published 2026-08-17. Last modified 2026-08-19.