CVE-2026-84207
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.
Does this matter?
Lower severity and a low EPSS score (0.35%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 4.0
- 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.35% probability · 28th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-918
- Source
- disclosure@vulncheck.com
EPSS 0.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/heymrun/heym
- https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py
- https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py
- https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c
- https://github.com/heymrun/heym/releases/tag/v0.0.98
- https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596
- https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.