CVE-2026-75588
Low
Description
Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717
SeverityLow
CVSS2.6
Exploit probability—
Product
Mattermost Desktop
PublishedSep 17, 2026
First seenSep 17, 2026
Weakness typeCWE-1287CWE-1287
How to fix
Update
- mattermost mattermost_desktop6.2.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_desktop | 6.2.0 ≤ v < 6.2.3 | 6.2.3 |
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