Vulnerability-Lookup

CVE-2026-70636 (GCVE-0-2026-70636)

Vulnerability from cvelistv5 – Published: 2026-08-06 21:31 – Updated: 2026-08-08 02:46 X_Open Source Unsupported When Assigned

Title

Flowise 3.1.4 Authentication Bypass via OAuth2 Credential Refresh Endpoint

Summary

Flowise through 3.1.4 contains an authentication bypass vulnerability that allows unauthenticated attackers to access the OAuth2 credential refresh endpoint by exploiting prefix-based whitelist matching in the authentication middleware defined in packages/server/src/utils/constants.ts. Attackers can send a POST request to the oauth2-credential refresh route with a trailing credential identifier to bypass all authentication and authorization checks, triggering unauthorized OAuth token rotation against credentials belonging to any workspace and potentially disrupting dependent OAuth integrations. This is a bypass of CVE-2026-41273.

Severity

8.7 (High)


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

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-08 02:46 UTC

CWE

CWE-862 - Missing Authorization

Assigner

VulnCheck

References

3 references

URL	Tags
https://github.com/Caycon/cve-advisories/blob/mai…	technical-descriptionexploit
https://flowiseai.com/sunset	vendor-advisory
https://www.vulncheck.com/advisories/flowise-auth…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FlowiseAI	Flowise	Affected: 0 , ≤ 3.1.4 (semver)

Date Public

2026-08-04 00:00

Credits

CayCon, piropatriot

Show details on NVD website

JSON

To clipboard

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GHSA-RM9R-9424-CCCF

Vulnerability from github – Published: 2026-08-07 00:31 – Updated: 2026-08-07 18:31

Details

Severity

7.5 (High)


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

8.7 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-70636"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-06T22:18:28Z",
    "severity": "HIGH"
  },
  "details": "Flowise through 3.1.4 contains an authentication bypass vulnerability that allows unauthenticated attackers to access the OAuth2 credential refresh endpoint by exploiting prefix-based whitelist matching in the authentication middleware defined in packages/server/src/utils/constants.ts. Attackers can send a POST request to the oauth2-credential refresh route with a trailing credential identifier to bypass all authentication and authorization checks, triggering unauthorized OAuth token rotation against credentials belonging to any workspace and potentially disrupting dependent OAuth integrations. This is a bypass of CVE-2026-41273.",
  "id": "GHSA-rm9r-9424-cccf",
  "modified": "2026-08-07T18:31:42Z",
  "published": "2026-08-07T00:31:21Z",
  "references": [
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70636"
    },
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      "url": "https://flowiseai.com/sunset"
    },
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    },
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  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/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",
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}

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-2026-70636 (GCVE-0-2026-70636)

GHSA-RM9R-9424-CCCF

Tags

Sightings

Nomenclature