CVE-2020-13891: Mattermost

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Mobile Apps before 1.31.2 on iOS. Unintended third-party servers could sometimes obtain authorization tokens, aka MMSA-2020-0022.

Affected products

• Mattermost Mattermost: before 1.31.2 (fixed in 1.31.2)

Published 2020-06-26. Last modified 2026-06-17.