{"id":"CVE-2026-46409","summary":"OpenYak local API: unauthenticated CSRF chain leads to Remote Code Execution","details":"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:\u003crandom port\u003e` (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.","aliases":["GHSA-ccxp-q2w5-27jw"],"modified":"2026-08-09T03:30:12.447629480Z","published":"2026-08-07T22:11:57.765Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-306","CWE-346","CWE-352","CWE-94","CWE-942"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46409.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46409.json"},{"type":"ADVISORY","url":"https://github.com/openyak/openyak/security/advisories/GHSA-ccxp-q2w5-27jw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46409"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openyak/openyak","events":[{"introduced":"0"},{"fixed":"b57cb51e4ed77b2815c4a984036c58fd42b9ccf0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.1.3"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.1.2","v1.1.1","v1.1.0","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46409.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"}]}