gethelio Helio up to 0.7.x Dashboard Sideband cross-domain policy

Summaryinfo

A vulnerability was found in gethelio Helio up to 0.7.x and classified as problematic. Affected is an unknown function of the component Dashboard Sideband. Executing a manipulation can lead to cross-domain policy. This vulnerability is handled as CVE-2026-65957. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in gethelio Helio up to 0.7.x. This vulnerability affects an unknown code of the component Dashboard Sideband. The manipulation with an unknown input leads to a cross-domain policy vulnerability. The CWE definition for the vulnerability is CWE-942. The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate. As an impact it is known to affect confidentiality. CVE summarizes:

Helio is an MCP proxy that sits between AI agents and the tools they use. Prior to version 0.8.0, the dashboard sideband (default 127.0.0.1:3100) validated CORS request origins by matching the hostname against a private-network string prefix (10., 172.16.–172.31., 192.168.) rather than validating an IP address. A public DNS name such as 192.168.attacker.com, 10.evil.io, or 172.16.pwn.example also satisfies that prefix, so the proxy echoed the attacker origin in Access-Control-Allow-Origin. This issue has been patched in version 0.8.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-65957 since 07/23/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 0.8.0 eliminates this vulnerability.

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Productinfo

Vendor

• gethelio

Name

• Helio

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7

Website

• Product: https://github.com/gethelio/helio/

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