Vulnerability in Proctorio Secure Exam Proctor Extension
CVE-2026-2345
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.
EPSS: 0.001 (0.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.6 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
Affected products
- Proctorio Secure Exam Proctor Extension — versions 1.5.25220.33, 1.5.25220.36
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-2345?
- CVE-2026-2345 is a low-severity vulnerability in Proctorio Secure Exam Proctor Extension, classified under Origin Validation Error. CVSS score: 3.6/10. Published 2026-02-11.
- How severe is CVE-2026-2345?
- Low severity. CVSS v3 base score is 3.6 out of 10.