What’s Vulnerable › Vulnerabilities

CVE-2026-86115: Sim before 0.8.14 Confused Deputy in Tool URL Routing Mints an Internal Token for a User-Supplied /api/ Path

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-05 · updated 2026-09-23
• Weakness: CWE-441

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.

Affected products

• SimStudioAI sim: before 0.8.14 — fixed in 0.8.14

How to fix

Upgrade to a fixed version: SimStudioAI sim 0.8.14. Check the vendor advisory for mitigations.

References

• https://github.com/geo-chen/oss/blob/main/sim.md
• https://github.com/simstudioai/sim
• https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/lib/auth/hybrid.ts
• https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/tools/index.ts
• https://github.com/simstudioai/sim/pull/7179
• https://www.vulncheck.com/advisories/sim-before-0.8.14-confused-deputy-in-tool-url-routing-mints-an-internal-token-for-a-user-supplied-api-path

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