OpenYak up to 1.1.2 Desktop Backend cross-domain policy

Summaryinfo

A vulnerability classified as problematic was found in OpenYak up to 1.1.2. Impacted is an unknown function of the component Desktop Backend. Such manipulation leads to cross-domain policy. This vulnerability is listed as CVE-2026-46409. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenYak up to 1.1.2. Affected by this issue is an unknown function of the component Desktop Backend. The manipulation with an unknown input leads to a cross-domain policy vulnerability. Using CWE to declare the problem leads to CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. Impacted is confidentiality. CVE summarizes:

OpenYak is a local-first agent runtime for reliable tool-using models, with a desktop workspace built on top. Prior to version 1.1.3, the OpenYak desktop backend binds an HTTP API to `127.0.0.1:<random port>` (commonly 19141) without server-side Origin validation, loopback authentication, or Content-Type enforcement, and with a wildcard CORS policy. Any webpage a user visits while OpenYak is running can issue cross-origin requests to this local server — the browser acts as a proxy into loopback, bypassing OS-level network isolation. Chained, this lets a malicious page execute arbitrary shell commands on the host (RCE) via the build agent with `permission_presets.bash=true`, shut down the service, and exfiltrate chat history and account PII — with no user interaction beyond opening the page. Version 1.1.3 patches the issue.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-46409 since 05/13/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.1.3 eliminates this vulnerability.

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Productinfo

Name

• OpenYak

Version

• 1.1.0
• 1.1.1
• 1.1.2

Website

• Product: https://github.com/openyak/openyak/

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