Quick answers
- Is CVE-2026-75025 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-75025 being exploited in the wild.
- How severe is CVE-2026-75025?
- Medium severity, with a CVSS score of 4.7, published 16 September 2026.
- Which products and versions are affected?
- Mattermost Desktop App <=6.2, fixed in 6.2.2.0.
- Is there a fix for CVE-2026-75025?
- A patch was published on 2026-09-16: Fixed in version 6.2.2.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-75025 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-75025?
- Check whether you run Mattermost Desktop App at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a content restriction bypass in Mattermost Desktop App versions 6.2 and earlier. The application did not sufficiently restrict server-rendered content from accessing local or private network resources, violating security sandboxing principles. An attacker controlling or compromising a Mattermost server could craft malicious content that, when rendered by the desktop client, accesses local files, internal network services, or performs unauthorized operations on the user's machine. Network-accessible attack vector, no authentication required from the attacker perspective (the user must be connected to a compromised server). The issue was fixed in version 6.2.2.0.
Affected products
- Mattermost Desktop App <=6.2, fixed in 6.2.2.0
Timeline
- 2026-09-16: disclosed
- 2026-09-16: patched: Fixed in version 6.2.2.0