Vulnerability in Mattermost Desktop App Allows Remote Crash
CVE-2026-3471

6.5MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
18 May 2026

What is CVE-2026-3471?

The Mattermost Desktop App is susceptible to a flaw that permits the loading of invalid URLs within a pop-up window. This weakness can be exploited by malicious actors to crash the application by invoking a specific JavaScript command. The impacted versions include 6.1, 6.0.1, and 5.4.13.0, which underscores the importance of addressing this issue to maintain application stability and security against potential attacks.

Affected Version(s)

Mattermost 0 <= 6.0.1

Mattermost 0 <= 5.4.13

Mattermost 6.2.0

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

game0v3r
.