CVE-2026-62316 Microsoft UFO: DNS Rebinding → Unauthenticated File Read / Command Execution
An attacker can use DNS rebinding to bypass localhost restrictions and execute commands or read files via the local MCP server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-62316?
CVE-2026-62316 is a high-severity server-side request forgery vulnerability in microsoft UFO, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Microsoft UFO open-source framework for intelligent automation across devices and platforms. Prior to 3.0.8, ufo/client/mcp/http_servers/linux_mcp_server.py binds a FastMCP streamable HTTP server to localhost:8010 but does not validate the Host, Origin, or Sec-Fetch-Site headers. An attacker-controlled web page can use DNS rebinding to reach the local /mcp endpoint, enumerate tool schemas through tools/list, and invoke execute_command with a valid UFO_MCP_API_KEY to read files or execute allowed operating system commands as the victim's user. This issue is fixed in version 3.0.8.
Which versions are affected by CVE-2026-62316?
How do I fix CVE-2026-62316?
No fix has been published for CVE-2026-62316 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-2026-62316 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62316 exists.
Sources
Also known as GHSA-vf4c-mf32-gf2h.