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VulnerabilityPublished

CVE-2026-75025: Mattermost Desktop App versions <=6.2 6.2.2.0 Fixed an issue where Mattermost Desktop did not sufficiently restrict server-rendered content from

Source GCVE Database

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Not known to be exploited · CVSS 4.7 Medium · fixed in 6.2.2.0 : update affected systems when convenient.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
4.7Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.2.2.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

AI-suggested

Upgrade Mattermost Desktop App to version 6.2.2.0 or later where this vulnerability is fixed. No other specific mitigations are indicated by the vendor advisory.

Description

Mattermost Desktop App versions up to 6.2.2.0 had a vulnerability where server-rendered content was not sufficiently restricted from accessing local or private network resources. This issue was fixed in version 6.2.2.0. The vulnerability has a medium severity with a CVSS score of 4.7 and involves a security bypass that could allow limited information disclosure.

References

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