CVE-2026-75587

Plaintext pre-auth secret exposure via Desktop App diagnostics report

3.6 Low

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

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.13%Unchanged since Aug 18, 2026

What each source reports

CVE List Score used 3.6

Plaintext pre-auth secret exposure via Desktop App diagnostics report

Record: CVE-2026-75587
CVSS 3.1: 3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

EUVDEUVD-2026-60543 3.6

Record: EUVD-2026-60543
CVSS 3.1: 3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-jq35-5w25-hqv7 3.6

Mattermost Desktop App versions <=6.2 6.2.2.0 fail to redact the pre-auth secret when generating...

Record: GHSA-jq35-5w25-hqv7
CVSS 3.1: 3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

NVD 3.6

Record: CVE-2026-75587
CVSS 3.1: 3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CVSS 3.1: 3.3 LowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

OSV 3.6

Plaintext pre-auth secret exposure via Desktop App diagnostics report

Record: CVE-2026-75587
CVSS 3.1: 3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-75587 is a low vulnerability (CVSS 3.6) in Mattermost, published August 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. No source names a fixed version.