# CVE-2026-62316: Microsoft UFO DNS rebinding bypass leading to file read and command execution

Source: https://junglewise.ai/threats/cve-2026-62316-microsoft-ufo-dns-rebinding-bypass-leading-to-file-read-and  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-21. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-62316 · Severity: high · CVSS 8.8 · Published 2026-08-21

Microsoft UFO is an open-source intelligent automation framework that runs a local HTTP server for executing system commands and file operations. Prior to version 3.0.8, the server fails to validate request headers, allowing an attacker-controlled web page to bypass origin restrictions via DNS rebinding, enumerate available operations, and execute arbitrary file reads or OS commands using a valid API key. This could lead to unauthorized access to sensitive files and system compromise.

Technologies: [Microsoft UFO](https://junglewise.ai/threats/technologies/ufo). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-62316 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-62316 being exploited in the wild.

**How severe is CVE-2026-62316?** High severity, with a CVSS score of 8.8, published 21 August 2026.

**Which products and versions are affected?** Microsoft UFO prior to 3.0.8.

**Is there a fix for CVE-2026-62316?** A patch was published on 2026-08-10: Fixed in version 3.0.8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-62316 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-62316?** Check whether you run Microsoft UFO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a DNS rebinding attack combined with missing Host/Origin/Sec-Fetch-Site header validation in the FastMCP HTTP server (linux_mcp_server.py) listening on localhost:8010. An attacker can host a malicious web page that performs DNS rebinding to reach the local /mcp endpoint, call tools/list to enumerate available command schemas, and invoke execute_command with a valid UFO_MCP_API_KEY to read arbitrary files or execute whitelisted OS commands as the authenticated user. The attack requires either knowledge of a valid UFO_MCP_API_KEY or exploitation of a related authentication bypass. This issue is fixed in version 3.0.8 by implementing proper header validation and per-command argument policies.

## Affected products

- Microsoft UFO prior to 3.0.8

## Timeline

- 2026-08-21: disclosed
- 2026-08-10: patched: Fixed in version 3.0.8

## References

- [https://github.com/microsoft/UFO/commit/3851c5d4e17c2865c56a94a6530692bf6e7a9b02](https://github.com/microsoft/UFO/commit/3851c5d4e17c2865c56a94a6530692bf6e7a9b02)
- [https://github.com/microsoft/UFO/releases/tag/v3.0.8](https://github.com/microsoft/UFO/releases/tag/v3.0.8)

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