CVE-2026-59973: FrontMCP vulnerable to SSRF in OpenAPI spec loading
FrontMCP
FrontMCP fails to properly validate external ref guards and resolve target addresses when loading OpenAPI specs. An authenticated user can exploit this vulnerability to trigger unauthorized network requests.
disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why
- CVSS
- 8.5
- EPSS
- <0.01 · top 66% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 15 Sep 2026
- last update
- 15 Sep 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-09-15CVE-2026-59973: FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP).NVD · nvd.nist.gov/vuln/detail/CVE-2026-59973
Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.
Classification
- lane
- Patch now
- AI role
- Attack on AI
- categories
- Infrastructure vulnerability
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- owasp llm top 10
- LLM03:2025 Supply Chain
- mitre atlas
- no technique for these categories
- dates
- happened 15 Sep 2026 · first reported 15 Sep 2026
- origin
- NVDVulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
- record
- confidence 0.95 · created 2026-10-18 06:33Z · updated 2026-10-18 06:33Z
Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned
Copy a brief
This record as a short Markdown brief, for a ticket, a chat or a coding agent.
the brief as text
# CVE-2026-59973: FrontMCP vulnerable to SSRF in OpenAPI spec loading https://gcdradar.vercel.app/incidents/cve-2026-59973-frontmcp-vulnerable-to-ssrf-in-openapi-spec-l · AIR-2026-0122 · closed 2026-09-15 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-09-15 - AI role: Attack on AI - Products: FrontMCP - CVE ids: CVE-2026-59973 - CVSS: 8.5 ## Summary FrontMCP fails to properly validate external ref guards and resolve target addresses when loading OpenAPI specs. An authenticated user can exploit this vulnerability to trigger unauthorized network requests. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-09-15: CVE-2026-59973: FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). (https://nvd.nist.gov/vuln/detail/CVE-2026-59973) ## Sources - 2026-09-15 NVD: CVE-2026-59973: FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). https://nvd.nist.gov/vuln/detail/CVE-2026-59973 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
Related
- closed9.3MCP servers & tools CVE-2026-67531: FrontMCP Sandbox Escape Leading to RCE
Patch now · Disclosed · since 6 Aug 2026 · CVE-2026-67531
AI - closed7.5MCP servers & tools FrontMCP SSRF Vulnerability in OpenAPI Specification Processing
Patch now · Disclosed · since 8 Apr 2026 · CVE-2026-39885
AI - closed7.2Portkey AI Gateway Portkey AI Gateway Server-Side Request Forgery Vulnerability
Patch now · Disclosed · since 14 Oct 2026 · CVE-2026-110719
AI - closed7.5MCP SDKs Model Context Protocol Python SDK Unbounded Session Accumulation Flaw
Patch now · Disclosed · since 14 Oct 2026 · updated 15 Oct 2026 · CVE-2026-59951
AI - closed7.5MCP SDKs Model Context Protocol Java SDK Unbounded Request Body Vulnerability
Patch now · Disclosed · since 14 Oct 2026 · CVE-2026-108395
AI - closed7.5MCP SDKs Model Context Protocol Python SDK Unbounded HTTP Body Memory Buffer Vulnerability
Patch now · Disclosed · since 14 Oct 2026 · CVE-2026-109527
AI