CVE-2026-74869: Stoatchat

High severity, CVSS 7.7. EPSS: 0.4% chance of exploitation in the next 30 days.

stoatchat before 0.15.0 contains a missing authorization vulnerability in the Subscribe message handler that allows authenticated attackers to enumerate members and monitor profile updates of private servers without membership. Attackers can subscribe to any server's member-update topic by sending a Subscribe message with an arbitrary server ID, receiving live UserUpdate events including display names, avatars, and status changes for members they should not have access to.

Affected products

• Stoatchat Stoatchat: before 0.15.0 (fixed in 0.15.0)

Published 2026-08-17. Last modified 2026-09-24.