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CVE-2026-2345

LOWCVSS 3.6/10EPSS 0.06%

Last modified

CVE-2026-2345 is a low-severity vulnerability rated 3.6/10 on the CVSS scale. 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. EPSS estimates a 0.06% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
3.6/10

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS Probability
0.06%

0.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is 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.
How severe is CVE-2026-2345?
CVE-2026-2345 has a CVSS score of 3.6/10 (LOW severity). The EPSS model estimates a 0.06% probability of exploitation in the next 30 days.
How do I fix CVE-2026-2345?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-2345?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST