CVE-2026-75587

LOW 3.6

Plaintext pre-auth secret exposure via Desktop App diagnostics report

CVSS Score

3.6

EPSS Score

0.0%

EPSS Percentile

0th

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

CWE	CWE-200
Vendor	mattermost
Product	mattermost
Published	Aug 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

Mattermost / Mattermost

0 ≤ 6.2.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Juho Forsén