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
References
History

Mon, 15 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 15 Jun 2026 16:00:00 +0000

Type Values Removed Values Added
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
Title Overly long URLs crash the Mattermost Desktop App
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-06-15T16:06:03.652Z

Reserved: 2026-05-15T14:13:41.661Z

Link: CVE-2026-8683

cve-icon Vulnrichment

Updated: 2026-06-15T16:05:35.592Z

cve-icon NVD

Status : Received

Published: 2026-06-15T16:16:34.700

Modified: 2026-06-15T16:16:34.700

Link: CVE-2026-8683

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.