CVE-2026-2345 — Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers
Proctorio Chrome Extension is a browser extension used for online proctoring. The extension contains multiple window.addEventListener('message', ...) handlers that do not proper…
Published: 2026-02-11 · CVSS: 3.6 · CVSS 3.1
Proctorio Chrome Extension is a browser extension used for online proctoring. The extension contains multiple window.addEventListener('message', ...) handlers that do not properly validate the origin of incoming messages. Specifically, an internal messaging bridge processes messages based solely on the presence of a fromWebsite property without verifying the event.origin attribute.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7