CVE-2026-86115 Sim before 0.8.14 Confused Deputy in Tool URL Routing Mints an Internal Token for a User-Supplied /api/ Path
Authenticated users can bypass SSRF protections to access internal endpoints and execute functions by exploiting URL routing flaws in Sim.
- 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-2026-86115?
CVE-2026-86115 is a medium-severity server-side request forgery vulnerability in simstudioai sim, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Sim before 0.8.14 classifies tool requests as internal based on URL prefix matching without scheme normalization, skipping SSRF validation and minting internal authentication tokens. Authenticated workflow authors can bypass external URL validation by supplying paths starting with /api/ in HTTP blocks to reach internal-only endpoints like POST /api/function/execute.
Weakness: CWE-441
Which versions are affected by CVE-2026-86115?
How do I fix CVE-2026-86115?
No fix has been published for CVE-2026-86115 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-2026-86115 being exploited?
There is no known exploitation of CVE-2026-86115 in the wild and no public exploit code.
Sources
Also known as GHSA-vfc8-q896-v58j.