CVE-2026-62316Public exploitNetwork attack vector

Command execution via unchecked rebinding requests

Published Aug 21, 2026 · Updated Aug 25, 2026

Origin validation failure in Microsoft UFO before 3.0.8 allows remote attackers with an API key to execute commands via DNS rebinding. The localhost FastMCP endpoint accepts nonlocal Host and Origin values, letting a browser reach /mcp after an attacker-controlled domain rebinds to loopback. A victim must visit the page; unauthenticated callers can enumerate tool schemas, while command execution or file reads require a valid UFO_MCP_API_KEY and run as the victim's user.

CVSS severity8.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation failure in Microsoft UFO before 3.0.8 allows remote attackers with an API key to execute commands via DNS rebinding. The localhost FastMCP endpoint accepts nonlocal Host and Origin values, letting a browser reach /mcp after an attacker-controlled domain rebinds to loopback. A victim must visit the page; unauthenticated callers can enumerate tool schemas, while command execution or file reads require a valid UFO_MCP_API_KEY and run as the victim's user.

The record

CVE
CVE-2026-62316
Published
Aug 21, 2026
Updated
Aug 25, 2026
Vendor
Microsoft
Product
UFO
Classifications
CWE-200, CWE-346, T1189, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · UFOversion=< 3.0.8

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-346Origin Validation Error
T1189Drive-by Compromise
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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