CVE-2026-81093 Apify Actors MCP Server before 0.9.12 Server-Side Request Forgery via get-html-skeleton
Attackers can exploit Server-Side Request Forgery in Apify Actors MCP Server to access internal network resources and cloud instance metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81093?
CVE-2026-81093 is a high-severity server-side request forgery vulnerability in apify actors-mcp-server, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-81093?
How do I fix CVE-2026-81093?
No fix has been published for CVE-2026-81093 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-81093 being exploited?
There is no known exploitation of CVE-2026-81093 in the wild and no public exploit code.
Sources
Also known as GHSA-gghj-77w7-6r3h, GHSA-m28f-9v8h-gg2f.