What is CVE-2026-86115?

CVE-2026-86115 is a medium-severity vulnerability in Simstudioai Sim, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 5.0/10. Published 2026-09-05.

How severe is CVE-2026-86115?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Vulnerability in Simstudioai Sim

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. 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 v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.

Affected products

Simstudioai Sim

Weakness classification (CWE)

CWE-441 — Unintended Proxy or Intermediary (Confused Deputy)

References

disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (issue-tracking, patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-86115?: CVE-2026-86115 is a medium-severity vulnerability in Simstudioai Sim, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 5.0/10. Published 2026-09-05.
How severe is CVE-2026-86115?: Medium severity. CVSS v3 base score is 5.0 out of 10.