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CVE-2026-75587Plaintext pre-auth secret exposure via Desktop App diagnostics report

Description

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

Timeline

  1. ID reserved

    By Mattermost

  2. Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-75587, by who scored it
Scored byCVSSScoreVector
MattermostCNA (assigner)3.1Low3.6CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
NVDNVD · Analyzed3.1Low3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
0.13% · top 97% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.6.

Affected products

What to do

Solution: Update Mattermost Desktop App to versions 6.3.0, 6.2.3.0 or higher.

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .