CVE-2026-8683
Medium
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
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mattermost Desktop
PublishedJun 15, 2026
First seenJun 15, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_desktop | v ≤ 5.13.0, 6.1.0 ≤ v ≤ 6.1.5 | — |
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