CVE-2020-14455: Mattermost Desktop

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Desktop App before 4.4.0. Prompting for HTTP Basic Authentication is mishandled, allowing phishing, aka MMSA-2020-0007.

Affected products

• Mattermost Mattermost Desktop: before 4.4.0 (fixed in 4.4.0)

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