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

CVE-2026-2345

Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
Proctorio / Secure Exam Proctor Extension	affected 1.5.25220.33; unaffected 1.5.25220.36

CWE

CWE-346

References

https://www.hckrt.com/hacktivity/46b61f36-b685-4667-aebf-82a67ad69ad6

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.