CVE-2017-18917: Mattermost Server

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. Weak hashing was used for e-mail invitations, OAuth, and e-mail verification tokens.

Affected products

• Mattermost Mattermost Server: from 3.6.0, before 3.6.7 (fixed in 3.6.7); from 3.7.0, before 3.7.5 (fixed in 3.7.5); from 3.8.0, before 3.8.2 (fixed in 3.8.2)

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