VulnerabilityReceived
CVE-2026-86115
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.
MEDIUM 5.3EPSS 0.30%
Does this matter?
Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.30% probability · 23th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-441
- Source
- disclosure@vulncheck.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.