What’s Vulnerable › Vulnerabilities

CVE-2026-65056: mcp-webresearch Server-Side Request Forgery in visit_page Due to Missing Internal-IP Filtering

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-21 · updated 2026-10-24
• Weakness: CWE-918

Description

mcp-webresearch 0.1.7 contains a server-side request forgery vulnerability that allows attackers to access internal network services by supplying loopback, link-local, or cloud metadata addresses to the visit_page tool, which only validates the URL protocol without filtering private or reserved IP ranges. Attackers can steer the LLM-controlled URL argument through prompt injection to navigate the server's Playwright browser to internal endpoints such as cloud instance metadata services, causing the server to return sensitive internal page content including credentials into the model context.

Affected products

• mzxrai mcp-webresearch: through 0.1.7

References

• https://github.com/geo-chen/oss/blob/main/mcp-webresearch.md
• https://www.npmjs.com/package/@mzxrai/mcp-webresearch
• https://www.vulncheck.com/advisories/mcp-webresearch-server-side-request-forgery-in-visit-page-due-to-missing-internal-ip-filtering
• https://github.com/geo-chen/oss/blob/main/mcp-webresearch.md

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