CVE-2026-100861 heym before 0.0.105 SSRF via credential-controlled base URLs
Authenticated users can bypass SSRF protections in heym by configuring malicious base URLs, allowing them to read internal service responses and cloud metadata.
- 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-2026-100861?
CVE-2026-100861 is a medium-severity server-side request forgery vulnerability in heymrun heym, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
heym before 0.0.105 fails to apply egress guards to integration services that use credential-supplied base URLs, allowing authenticated users to bypass SSRF protections. Attackers can configure credentials pointing to loopback, private, or cloud-metadata addresses and read internal service responses returned as workflow node output.
Weakness: CWE-918
Which versions are affected by CVE-2026-100861?
How do I fix CVE-2026-100861?
No fix has been published for CVE-2026-100861 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-2026-100861 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100861 exists.
Sources
Also known as GHSA-77h5-29x8-rvxj, GHSA-xchj-mw74-2232.