- CVSS
- HIGH · 8.2v3.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- Published
- 2026-07-21
- Weakness
- CWE-918
- Source
- nvd.nist.gov/vuln/detail/CVE-2026-65056
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.
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
How GTK Cyber trains on this
AI security training at GTK Cyber covers the LLM and ML-pipeline vulnerability classes that vulnerabilities like CVE-2026-65056 fall into. Our hands-on courses are taught by Charles Givre and other practitioners who break and defend production AI systems.