CVE-2026-8683 MEDIUM

CVE-2026-8683: Overly long URLs crash the Mattermost Desktop App

Vendor Mattermost
Product Mattermost
Weakness CWE-770 · Uncontrolled resource consumption
Published June 15, 2026
Last update June 15, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652

Key dates

02Disclosure timeline

June 15, 2026 CVE published
June 15, 2026 Record updated