CVE-2026-86115: Simstudioai Sim

Medium severity, CVSS 5.0. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Simstudioai Sim: before 0.8.14 (fixed in 0.8.14)

Published 2026-09-05. Last modified 2026-09-23.