CVE-2026-2345 – Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers

CVE ID : CVE-2026-2345

Published : Feb. 11, 2026, 3:16 p.m. | 1 hour, 8 minutes ago

Description : 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.

Severity: 3.6 | LOW

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