Security Advisory

CVE-2026-8683

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-15 14:06:21

Last updated 2026-06-15 16:06:03

Assigner Mattermost

CVSS score 6.5

State PUBLISHED

Description

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

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