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CVE-2026-27124 FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities

🗓️ 03 Apr 2026 15:22:17Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 28 Views

FastMCP OAuthProxy failed consent on authorization codes, enabling confused deputy; fixed 3.2.0.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-27124
3 Apr 202615:22
attackerkb
Chainguard
CVE-2026-27124 vulnerabilities
18 Jul 202614:17
cgr
Circl
CVE-2026-27124
3 Apr 202616:05
circl
CNNVD
FastMCP 安全漏洞
3 Apr 202600:00
cnnvd
CVE
CVE-2026-27124
3 Apr 202615:22
cve
Github Security Blog
FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities
31 Mar 202622:32
github
NVD
CVE-2026-27124
3 Apr 202616:16
nvd
OSV
CGA-5Q86-M9JF-Q7RW
18 Jul 202613:09
osv
OSV
CVE-2026-27124 FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities
3 Apr 202615:22
osv
OSV
ECHO-86A3-9D3C-B622
13 May 202618:24
osv
Rows per page
[
  {
    "vendor": "jlowin",
    "product": "fastmcp",
    "versions": [
      {
        "version": "< 3.2.0",
        "status": "affected"
      }
    ]
  }
]

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