Vulnerability-Lookup

CVE-2026-86115 (GCVE-0-2026-86115)

Vulnerability from cvelistv5 – Published: 2026-09-05 09:59 – Updated: 2026-09-08 18:09

Title

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

Summary

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.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 18:09 UTC

CWE

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

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://github.com/geo-chen/oss/blob/main/sim.md	technical-description
https://github.com/simstudioai/sim/blob/v0.8.13/a…	technical-description
https://github.com/simstudioai/sim/blob/v0.8.13/a…	technical-description
https://github.com/simstudioai/sim/pull/7179	patchissue-tracking
https://github.com/simstudioai/sim	product
https://www.vulncheck.com/advisories/sim-before-0…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
simstudioai	sim	Affected: 0 , < 0.8.14 (semver) cpe:2.3:a:sim:sim::::::::

Date Public

2026-09-04 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86115

Vulnerability from fkie_nvd - Published: 2026-09-05 10:16 - Updated: 2026-09-08 19:20

Severity

5.0 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Summary

References

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/geo-chen/oss/blob/main/sim.md"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/simstudioai/sim"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/lib/auth/hybrid.ts"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/tools/index.ts"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/simstudioai/sim/pull/7179"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "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"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-441"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-VFC8-Q896-V58J

Vulnerability from github – Published: 2026-09-05 12:31 – Updated: 2026-09-05 12:31

Details

Severity

5.0 (Medium)


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

5.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-86115"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-441"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-05T10:16:42Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-vfc8-q896-v58j",
  "modified": "2026-09-05T12:31:25Z",
  "published": "2026-09-05T12:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86115"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simstudioai/sim/pull/7179"
    },
    {
      "type": "WEB",
      "url": "https://github.com/geo-chen/oss/blob/main/sim.md"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simstudioai/sim"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/lib/auth/hybrid.ts"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simstudioai/sim/blob/v0.8.13/apps/sim/tools/index.ts"
    },
    {
      "type": "WEB",
      "url": "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-86115 (GCVE-0-2026-86115)

FKIE_CVE-2026-86115

GHSA-VFC8-Q896-V58J

Tags

Sightings

Nomenclature