CVE-2026-75587

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

Score

CVSS 3.1 3.6 Low

Status

Analyzed - responsibledisclosure@mattermost.com

Published

2026-08-17

Last modified

2026-08-18

Weaknesses

CWE-200

Affected products

• Mattermost (Mattermost)
• Mattermost Desktop (Mattermost)

References

• https://mattermost.com/security-updates