CVE-2026-84207

Summary

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 Software

Weaknesses

• CWE-918: Server-Side Request Forgery (SSRF)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/heymrun/heym
• https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596
• https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c
• https://github.com/heymrun/heym/releases/tag/v0.0.98
• https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py
• https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py
• https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints

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