CVE-2019-20864: Mattermost Plugins

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Plugins before 5.13.0. The GitHub plugin allows an attacker to attach his Mattermost account to a different person's GitHub account.

Affected products

• Mattermost Mattermost Plugins: before 5.13.0 (fixed in 5.13.0)

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