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Vulnerability IntelligenceCVE-2026-3471

CVE-2026-3471

MEDIUM6.5

Opening a window with {{javascript:alert()}} as URL causes crash in the Mattermost Desktop App

Published May 18, 2026

Modified 1 months ago

Details

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in the Mattermost Desktop App which allows a malicious server owner to repeated crash the application via calling {{window.open('javascript:alert()');}}. Mattermost Advisory ID: MMSA-2026-00618

References

https://mattermost.com/security-updates

https://www.cve.org/CVERecord?id=CVE-2026-3471

CVSS Analysis

CVSS v3.1

6.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

NoneI:N

Availability

HighA:H

6.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedMay 18, 2026

ModifiedMay 18, 2026

CVE-2026-3471 | Mondoo Vulnerability Intelligence