Proctorio Secure Exam Proctor Extension up to 1.5.25220.33 Incoming Message origin validation

Summaryinfo

A vulnerability was found in Proctorio Secure Exam Proctor Extension up to 1.5.25220.33. It has been classified as problematic. Affected is an unknown function of the component Incoming Message Handler. This manipulation causes origin validation. This vulnerability appears as CVE-2026-2345. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Proctorio Secure Exam Proctor Extension up to 1.5.25220.33. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Incoming Message Handler. The manipulation with an unknown input leads to a origin validation vulnerability. The CWE definition for the vulnerability is CWE-346. The product does not properly verify that the source of data or communication is valid. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at hckrt.com. This vulnerability is known as CVE-2026-2345 since 02/11/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.5.25220.36 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Proctorio

Name

• Secure Exam Proctor Extension

Version

• 1.5.25220.0
• 1.5.25220.1
• 1.5.25220.2
• 1.5.25220.3
• 1.5.25220.4
• 1.5.25220.5
• 1.5.25220.6
• 1.5.25220.7
• 1.5.25220.8
• 1.5.25220.9
• 1.5.25220.10
• 1.5.25220.11
• 1.5.25220.12
• 1.5.25220.13
• 1.5.25220.14
• 1.5.25220.15
• 1.5.25220.16
• 1.5.25220.17
• 1.5.25220.18
• 1.5.25220.19
• 1.5.25220.20
• 1.5.25220.21
• 1.5.25220.22
• 1.5.25220.23
• 1.5.25220.24
• 1.5.25220.25
• 1.5.25220.26
• 1.5.25220.27
• 1.5.25220.28
• 1.5.25220.29
• 1.5.25220.30
• 1.5.25220.31
• 1.5.25220.32
• 1.5.25220.33

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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