CVE-2026-2345: Proctorio Secure Exam Proctor Extension

Low severity, CVSS 3.6. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Proctorio Secure Exam Proctor Extension: version 1.5.25220.33 only

Published 2026-02-11. Last modified 2026-06-17.