EUVD-2026-91161
GHSA-v78q-44mm-wf7q
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
Network-reachable, low-complexity SSRF with no authentication (PR:N) or interaction; limited confidentiality and integrity impact from reaching internal/metadata services, no availability impact.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
3DescriptionCVE.org
A security vulnerability has been detected in modelcontextprotocol mcp-server-fetch and mcp-server-everything up to 2026.6.4. Affected is the function fetch_url of the file mcp_server_fetch/server.py of the component Fetch Tool. The manipulation of the argument url/path leads to server-side request forgery. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.
AnalysisAI
Server-side request forgery in the Model Context Protocol reference Fetch Tool (mcp-server-fetch, and the related mcp-server-everything) up to 2026.6.4 lets unauthenticated remote callers direct the fetch_url function at internal or otherwise restricted destinations by supplying a crafted url/path argument, with no destination validation in the default configuration. Impact is bounded but real: the assessed vector rates confidentiality and integrity impact as low with no availability impact, and the primary abuse case is reaching loopback services, private RFC1918 ranges, and cloud instance metadata endpoints (for example 169.254.169.254 and 100.100.100.100) from the server's network position rather than executing code. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the mcp-server-fetch (or mcp-server-everything) Fetch Tool be deployed and reachable with an attacker-influenceable url/path argument to fetch_url - in practice this means an MCP client/agent that forwards untrusted URLs (directly or via prompt injection) to the tool. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but moderate-severity server-side request forgery (CWE-918) in the reference MCP Fetch Tool, not an inflated high-CVSS issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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