Improper Access Control in Mattermost Desktop Application
CVE-2026-75025

4.7MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 September 2026

What is CVE-2026-75025?

The Mattermost Desktop App has a vulnerability that allows server-rendered content to improperly access local or private network resources. This issue, noted in versions up to 6.2 and 6.2.2.0, could enable potential exposure of sensitive information. The issue was addressed through an update made possible by responsible disclosure efforts from community contributor game0v3r. For further details, refer to the Mattermost advisory.

Affected Version(s)

Mattermost 0 <= 6.2.2

Mattermost 6.3.0

Mattermost 6.2.3.0

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
4.7
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

game0v3r
.