CVE-2026-86115

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreHIGH confidence

Score 5.0 from GitHub Security Advisory published 2026-09-05. a secondary CVSS source baseline 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
5.0
EG Score
5.0(high)
EG Risk
23(Track)
EG Risk 23/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity50% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 8, 2026

Advisory Details (6)

Auto-updated Sep 5, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

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

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
github_pr

refactor(tools): execute internal operations in process

Fix merged in simstudioai/sim PR #7179 on 2026-08-28 — awaiting tagged release

https://github.com/simstudioai/sim/pull/7179
generic

sim/apps/sim/tools/index.ts at v0.8.13 · simstudioai/sim · GitHub

https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/tools/index.ts
generic

sim/apps/sim/lib/auth/hybrid.ts at v0.8.13 · simstudioai/sim · GitHub

https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/lib/auth/hybrid.ts
generic

GitHub - simstudioai/sim: Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders. · GitHub

https://github.com/simstudioai/sim
generic

oss/sim.md at main · geo-chen/oss · GitHub

https://github.com/geo-chen/oss/blob/main/sim.md

Vendor Advisories for CVE-2026-86115(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 08:03 UTCEG score recompute
  2. 2026-09-19 08:03 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 09:08 UTCEG score recompute
  5. 2026-09-18 09:08 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 10:13 UTCEG score recompute
  8. 2026-09-17 10:13 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 11:17 UTCEG score recompute
  11. 2026-09-16 11:17 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 12:23 UTCEG score recompute
  14. 2026-09-15 12:23 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 13:27 UTCEG score recompute
  18. 2026-09-14 13:27 UTCGHSA enrichment
  19. 2026-09-13 14:32 UTCGHSA enrichment
  20. 2026-09-12 15:37 UTCEG score recompute
  21. 2026-09-12 15:37 UTCGHSA enrichment
  22. 2026-09-11 16:42 UTCEG score recompute
  23. 2026-09-11 16:42 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 16 more
  1. 2026-09-10 17:46 UTCEG score recompute
  2. 2026-09-10 17:46 UTCGHSA enrichment
  3. 2026-09-09 18:51 UTCEG score recompute
  4. 2026-09-09 18:50 UTCGHSA enrichment
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-08 19:55 UTCEG score recompute
  7. 2026-09-08 19:55 UTCGHSA enrichment
  8. 2026-09-08 07:06 UTCEG score recompute
  9. 2026-09-08 07:06 UTCGHSA enrichment
  10. 2026-09-07 08:09 UTCEG score recompute
  11. 2026-09-07 08:09 UTCGHSA enrichment
  12. 2026-09-06 13:48 UTCEPSS rescore
  13. 2026-09-06 09:14 UTCEG score recompute
  14. 2026-09-06 09:13 UTCGHSA enrichment
  15. 2026-09-05 10:16 UTCEG score recompute
  16. 2026-09-05 10:13 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-86115?
CVE-2026-86115 is a medium vulnerability published on September 5, 2026. 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…
When was CVE-2026-86115 disclosed?
CVE-2026-86115 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86115 actively exploited?
CVE-2026-86115 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.1% of all scored CVEs.
What is the CVSS score of CVE-2026-86115?
CVE-2026-86115 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-86115?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86115, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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