CVEvulnerability

CVE-2026-46409

9.6 CRITICAL Published 2026-08-07 Modified 2026-09-18 Official page ↗
Status
Deferred
Published
2026-08-07
Last modified
2026-09-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.6 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weaknesses
CWE-306, CWE-346, CWE-352, CWE-94, CWE-942

Description

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.

Related

Weakness · CWE (5)

  • CWE-306 Missing Authentication for Critical Functionality weakness
  • CWE-346 Origin Validation Error weakness
  • CWE-352 Cross-Site Request Forgery weakness
  • CWE-94 Improper Control of Generation of Code weakness
  • CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains weakness

References