CVE-2026-84207 Heym before 0.0.98 SSRF via WebSocket endpoints
Authenticated users can exploit missing SSRF guards in WebSocket nodes to access internal services and read responses.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84207?
CVE-2026-84207 is a medium-severity server-side request forgery vulnerability in heymrun heym, published on 1 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-84207?
How do I fix CVE-2026-84207?
No fix has been published for CVE-2026-84207 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-84207 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84207 exists.
Sources
Also known as GHSA-488w-5jv5-7w7q, GHSA-mqw6-g845-w596.