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Vulnerabilities

Vulnerability · CVE-2026-2345

Proctorio Chrome Extension is a browser extension used for online proctoring.

Published Feb 11, 2026 · catalog updated Feb 11, 2026 · Proctorio Secure Exam Proctor Extension

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-2345. EPSS is 0.08%. Act only if a listed version of Proctorio Secure Exam Proctor Extension is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.08%
Remediation
Vendor / distro source
Affected products
vendor Proctorio Secure Exam Proctor Extension 1.5.25220.33

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Proctorio Secure Exam Proctor Extension 1.5.25220.331.5.25220.33

How to fix CVE-2026-2345

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-2345. EPSS is 0.08%. Act only if a listed version of Proctorio Secure Exam Proctor Extension is installed.

Which versions are affected?

Compare what you have installed with Proctorio Secure Exam Proctor Extension 1.5.25220.33 1.5.25220.33. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.08%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 11, 2026 · EUVD

    Detected

    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.

  2. Feb 11, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-2345

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-2345

    30-day exploitation probability 0.08%

    first.org
  • EUVDVulnerability recordEUVD-2026-6252

    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 messa

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • FIRST EPSSNov 3, 2026
  • EUVDNov 3, 2026