CVE-2026-81093
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk39th percentile - higher than 39% of all known CVEs
Summary
The get-html-skeleton tool fetched a URL supplied by the caller after checking only its syntax. The validation did not inspect the host name or the resolved address, so loopback, link-local and private ranges were allowed, including cloud instance metadata addresses. Any caller of the MCP server could read the result of a request to an internal endpoint. Version 0.9.12 removes the tool.
Risk Assessment
Ability to read internal endpoints, including instance metadata, may lead to theft of cloud credentials.
Recommendation
Upgrade to version 0.9.12 or later, which removes the tool.
Original NVD description (English source)
The get-html-skeleton tool fetched a URL the caller supplied after checking only its syntax. The handler in src/tools/common/get_html_skeleton.ts validated the url argument with isValidHttpUrl from src/utils/generic.ts, which confirmed the string began with an http or https scheme and parsed as a URL and inspected neither the host name nor the address it resolves to. Loopback, link-local and private ranges therefore passed, including the address cloud providers use to serve instance metadata. The unchecked URL was handed to the web-browser actor and the fetched document was returned in the tool response, so any caller of the MCP server could make it request an endpoint reachable only from the host and read the result, including instance credentials. Version 0.9.12 removes the tool.