# CVE-2026-75587 — Mattermost

> As of 2026-08-18, CVE-2026-75587 is a LOW-severity vulnerability in Mattermost, CVSS v3.1 3.6, EPSS 0.1% (1.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-75587 as of 2026-08-18; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-18

## What is 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

The record classifies CVE-2026-75587 under weakness class [CWE-200](https://intel.threadlinqs.com/cwe/CWE-200). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 49 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 3.6 — LOW (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 1.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 1.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-17, last modified 2026-08-18

## Is CVE-2026-75587 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Mattermost](https://intel.threadlinqs.com/vendors/mattermost): Mattermost

## How to fix CVE-2026-75587

No vendor patch reference has been recorded for CVE-2026-75587 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-75587

No threat campaign in the Threadlinqs corpus currently references CVE-2026-75587, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-08-18.

**Vendor advisory and patch**

- [mattermost.com — vendor advisory](https://mattermost.com/security-updates)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-75587
Full detection coverage and IOCs for threats exploiting CVE-2026-75587 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp