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CVE-2026-123272

🗓️ 05 Nov 2026 18:45:36Reported by VulnCheckType 
cve
 cve
🔗 web.nvd.nist.gov👁 4 Views

Improper validation in mcp-go OAuthHandler.fetchServerMetadata allows token theft.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
cvelist
Cvelist
CVE-2026-123272 mcp-go before v1.2.1 Origin Validation Error via Unvalidated Well-Known Protected Resource Metadata
5 Nov 202618:45
–cvelist
euvd
EUVD
EUVD-2026-117725
5 Nov 202618:45
–euvd
nvd
NVD
CVE-2026-123272
5 Nov 202619:17
–nvd
Vulners
Node
mark3labsmcp-goRange0.48.0–1.2.1
[
  {
    "vendor": "mark3labs",
    "product": "mcp-go",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "v0.48.0",
        "lessThan": "v1.2.1",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "packageURL": "pkg:golang/github.com/mark3labs/mcp-go",
    "repo": "https://github.com/mark3labs/mcp-go"
  }
]

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05 Nov 2026 19:17Current
6.1Medium risk
Vulners AI Score6.1
CVSS 45
CVSS 3.18
4