mcp-webresearch Server-Side Request Forgery in visit_page Due to Missing Internal-IP Filtering (CVE-2026-65056) | HOL Guard CVE

High · CVSS 8.3CVE-2026-65056

mcp-webresearch Server-Side Request Forgery in visit_page Due to Missing Internal-IP Filtering

Answer in brief

CVE-2026-65056 records a High severity (CVSS 8.3) vulnerability in mcp-webresearch Server-Side Request Forgery in visit_page Due to Missing Internal-IP Filtering. The current sources do not mark it as known exploited. The current feed maps mzxrai/mcp-webresearch (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 21, 2026Updated Sep 24, 2026Source checked Sep 24, 2026First seen by HOL Sep 24, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps mzxrai/mcp-webresearch (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
mzxrai/mcp-webresearchgeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for mzxrai/mcp-webresearch.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jul 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 24, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.