CVE-2018-21265: Mattermost Desktop

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Desktop App before 4.0.0. It mishandled the Same Origin Policy for setPermissionRequestHandler (e.g., video, audio, and notifications).

Affected products

• Mattermost Mattermost Desktop: before 4.0.0 (fixed in 4.0.0)

Published 2020-06-19. Last modified 2026-06-17.