Vulnerability-Lookup

CVE-2026-90474 (GCVE-0-2026-90474)

Vulnerability from cvelistv5 – Published: 2026-09-12 11:06 – Updated: 2026-09-15 16:58

Title

MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass

Summary

MCPHub before 1.0.32 contains an authentication bypass vulnerability in its embedded OAuth 2.0 authorization server where client authentication is disabled by default and PKCE enforcement is optional. Attackers who obtain an authorization code through interception can redeem it for access tokens without providing a client secret or PKCE verifier, gaining access to victim accounts and their privileges.

Severity

7.6 (High)


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

6.8 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 16:57 UTC

CWE

CWE-287 - Improper Authentication

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/samanhappy/mcphub/security/adv…	third-party-advisoryvendor-advisory
https://github.com/samanhappy/mcphub/commit/e9276…	patch
https://github.com/samanhappy/mcphub/blob/v1.0.31…	technical-description
https://github.com/samanhappy/mcphub/releases/tag…	release-notes
https://www.vulncheck.com/advisories/mcphub-befor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
samanhappy	mcphub	Affected: 0 , < 1.0.32 (semver)	guessed

Date Public

2026-08-23 07:25

Credits

Wayde Shi (PayPal Cyber Security Team)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-90474

Vulnerability from fkie_nvd - Published: 2026-09-12 11:16 - Updated: 2026-09-15 17:17

Severity

6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38
	disclosure@vulncheck.com	https://github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9f
	disclosure@vulncheck.com	https://github.com/samanhappy/mcphub/releases/tag/v1.0.32
	disclosure@vulncheck.com	https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypass
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9f"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/samanhappy/mcphub/releases/tag/v1.0.32"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypass"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-C47M-M826-FC8G

Vulnerability from github – Published: 2026-09-12 12:30 – Updated: 2026-09-12 12:30

Details

Severity

6.8 (Medium)


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

7.6 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-90474"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-12T11:16:34Z",
    "severity": "HIGH"
  },
  "details": "MCPHub before 1.0.32 contains an authentication bypass vulnerability in its embedded OAuth 2.0 authorization server where client authentication is disabled by default and PKCE enforcement is optional. Attackers who obtain an authorization code through interception can redeem it for access tokens without providing a client secret or PKCE verifier, gaining access to victim accounts and their privileges.",
  "id": "GHSA-c47m-m826-fc8g",
  "modified": "2026-09-12T12:30:51Z",
  "published": "2026-09-12T12:30:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90474"
    },
    {
      "type": "WEB",
      "url": "https://github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38"
    },
    {
      "type": "WEB",
      "url": "https://github.com/samanhappy/mcphub/releases/tag/v1.0.32"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypass"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/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",
      "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-90474 (GCVE-0-2026-90474)

FKIE_CVE-2026-90474

GHSA-C47M-M826-FC8G

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Nomenclature

Related by attack behaviour