Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.6epss 0.1%
exploitation probability
0.1%top 100% of all CVEs
observed exploitation
nono source reports it
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.
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