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TI-2026-01982 Aliases CVE-2026-2345GHSA-f688-gwj3-8h54

Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers

Priority LOW 16CWE-346Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-346.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00078 0th percentileScored 2026-11-07
Fix Fixed Secure Exam Proctor Extension (Proctorio): 1.5.25220.36

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ProctorioSecure Exam Proctor Extension1.5.25220.331.5.25220.36Patch availableCNA
  • Secure Exam Proctor Extension VendorProctorio Affected 1.5.25220.33 Fixed in 1.5.25220.36 Patch available CNA

Remediation

  • Fix · CNA Secure Exam Proctor Extension (Proctorio) Fixed in 1.5.25220.36

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-2345
  2. 2026-10-03 Alias added: GHSA-f688-gwj3-8h54

References

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences