CVE-2026-84207: Heymrun Heym

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Heym before 0.0.98 fails to apply SSRF egress guards to WebSocket Send and WebSocket Trigger nodes, allowing authenticated users to connect to internal services. Attackers can craft workflow nodes with arbitrary URLs and headers to reach internal services and read responses from the WebSocket Trigger node.

Affected products

• Heymrun Heym: before 0.0.98 (fixed in 0.0.98)

Published 2026-09-01. Last modified 2026-09-08.