Vulnerability · Published Aug 7, 2026 · Assigned by GitHub_M

CVE-2026-46409OpenYak local API: unauthenticated CSRF chain leads to Remote Code Execution

Critical 9.6

In plain English

A critical-severity code injection in openyak from openyak. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.3%top 79.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
openyak	openyak	< 1.1.3

Weakness: CWE-94, CWE-306, CWE-346, CWE-352, CWE-942 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

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