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.
History

Wed, 11 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Proctorio
Proctorio secure Exam Proctor Extension
Vendors & Products Proctorio
Proctorio secure Exam Proctor Extension
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 11 Feb 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers
Weaknesses CWE-346
References
Metrics cvssV3_1

{'score': 3.6, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Hackrate

Published:

Updated: 2026-02-11T21:19:08.551Z

Reserved: 2026-02-11T14:45:32.162Z

Link: CVE-2026-2345

cve-icon Vulnrichment

Updated: 2026-02-11T21:19:06.078Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-11T15:16:18.160

Modified: 2026-02-11T15:27:26.370

Link: CVE-2026-2345

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T21:38:03Z