CVE-2026-2345
Insufficient Origin Validation in Proctorio Chrome Extension postMessage Handlers
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.
INFO
Published Date :
Feb. 11, 2026, 3:16 p.m.
Last Modified :
Feb. 11, 2026, 3:27 p.m.
Remotely Exploit :
No
Source :
7004884b-51e2-48e8-b4a2-5ca29e80453e
Affected Products
The following products are affected by CVE-2026-2345
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | 7004884b-51e2-48e8-b4a2-5ca29e80453e |
Solution
- Validate the 'event.origin' attribute for all incoming messages.
- Ensure the messaging bridge does not trust the 'fromWebsite' property alone.
- Update the Proctorio Chrome Extension to the latest secure version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2345.
| URL | Resource |
|---|---|
| https://www.hckrt.com/hacktivity/46b61f36-b685-4667-aebf-82a67ad69ad6 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2345 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2345
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2345 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-2345 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 7004884b-51e2-48e8-b4a2-5ca29e80453e
Feb. 11, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N Added CWE CWE-346 Added Reference https://www.hckrt.com/hacktivity/46b61f36-b685-4667-aebf-82a67ad69ad6