CVE-2026-2345Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers
Updated under an hour ago ()
Does this affect you?
It affects Proctorio Secure Exam Proctor Extension. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 3.6 LOW (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-346
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Hackrate
- NVD analysis
- Deferred
- Record last updated
- Feb 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Proctorio Secure Exam Proctor Extension proctorio:secure_exam_proctor_extension (from the name) | 1.5.25220.33; 1.5.25220.36 not affected | CNA record |
References
- https://www.hckrt.com/hacktivity/46b61f36-b685-4667-aebf-82a67ad69ad6
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.