CVE-2025-61987: Groupsession

Medium severity, CVSS 6.9. EPSS: 0.2% chance of exploitation in the next 30 days.

GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. do not validate origins in WebSockets. If a user accesses a crafted page, Chat information sent to the user may be exposed.

Affected products

• Groupsession Groupsession: before 5.3.0 (fixed in 5.3.0); before 5.3.2 (fixed in 5.3.2); before 5.3.3 (fixed in 5.3.3)

Published 2025-12-12. Last modified 2026-10-07.