CVE-2026-75587

Summary

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 Software

VendorProductVersion RangeStatus
MattermostMattermost0 <= 6.2.2affected
MattermostMattermost6.3.0unaffected
MattermostMattermost6.2.3.0unaffected

Weaknesses

  • CWE-200: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References