CVE-2026-86115

MEDIUM 5.0

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

CVSS Score

5.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-441
Vendor	simstudioai
Product	sim
Published	Sep 5, 2026
Last Updated	Sep 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

simstudioai / sim

0 < 0.8.14

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/geo-chen/oss/blob/main/sim.md github.com: https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/tools/index.ts github.com: https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/lib/auth/hybrid.ts github.com: https://github.com/simstudioai/sim/pull/7179 github.com: https://github.com/simstudioai/sim vulncheck.com: 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

Credits

🔍 George Chen