CVE-2026-75588
LOW
NVD
CVSS Score
2.6
Severity
LOW
Published
Sep 17, 2026
Vendor
unknown
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