CVE-2019-20870: Mattermost Server

Medium severity, CVSS 4.3. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 5.10.0. An attacker can bypass the intended appearance of the Edited flag after changing a post's file ID.

Affected products

• Mattermost Mattermost Server: before 5.10.0 (fixed in 5.10.0)

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