# 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.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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 available:** No
- **Published:** 21 Aug 2026
- **Updated:** 25 Aug 2026
- **Also known as:** GHSA-vf4c-mf32-gf2h

## 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.

Weakness: CWE-346 (Origin Validation Error), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## 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.

## Is CVE-2026-62316 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62316 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-62316 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62316 exists.

Affected product: microsoft UFO. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-62316/ (Markdown: https://insights.sbomify.com/CVE-2026-62316/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-62316
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-62316
- OSV: https://osv.dev/vulnerability/CVE-2026-62316

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-62316/
Summaries are generated and may contain mistakes; the official description above is the record.