{"id":"CVE-2023-5654","aliases":[],"url":"https://o3.security/vulnerability/CVE-2023-5654","summary":"The React Developer Tools extension registers a message listener with window.addEventListener('message', <listener>) in a content script that is accessible to any webpage that is active…","details":"The React Developer Tools extension registers a message listener with window.addEventListener('message', <listener>) in a content script that is accessible to any webpage that is active in the browser. Within the listener is code that requests a URL derived from the received message via fetch(). The URL is not validated or sanitised before it is fetched, thus allowing a malicious web page to arbitrarily fetch URL’s via the victim's browser.","published":"2023-10-19T15:15:09.973","modified":"2026-06-17T06:49:01.203","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"FIX","url":"https://gist.github.com/CalumHutton/1fb89b64409570a43f89d1fd3274b231"},{"type":"FIX","url":"https://gist.github.com/CalumHutton/1fb89b64409570a43f89d1fd3274b231"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-06-17T06:49:01.203"}}