CVE-2026-46409

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.

CVSS v3 9.6 CRITICAL

9.6^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/openyak/openyak/security/advisories/GHSA-ccxp-q2w5-27jw

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-07 23:17

Updated : 2026-08-11 02:16

NVD link : CVE-2026-46409

Mitre link : CVE-2026-46409

CVE.ORG link : CVE-2026-46409

JSON object : View

Products Affected

No product.

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

CWE-306

Missing Authentication for Critical Function

CWE-346

Origin Validation Error

CWE-352

Cross-Site Request Forgery (CSRF)

CWE-942

Permissive Cross-domain Security Policy with Untrusted Domains

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