Vulnerability · Published Aug 27, 2026 · Assigned by VulnCheck
CVE-2026-81093Apify Actors MCP Server before 0.9.12 Server-Side Request Forgery via get-html-skeleton
High 8.6
In plain English
A high-severity server-side request forgery in actors-mcp-server from apify. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| apify | actors-mcp-server | 0 – before 0.9.12 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
References
- https://github.com/apify/apify-mcp-server product
- https://github.com/apify/apify-mcp-server/pull/572 issue-tracking, patch
- GitHub Security Advisory (GHSA-m28f-9v8h-gg2f) vendor-advisory
- VulnCheck Advisory: Apify Actors MCP Server before 0.9.12 Server-Side Request Forgery via get-html-skeleton third-party-advisory