#1461 new

Exponent CMS 2.6.0 patch2 Stored Cross-Site Scripting (User-Agent)

Reported by Oscar | January 25th, 2022 @ 03:42 PM

Bug description

Exponent CMS 2.6.0 patch2 allows an authenticated user to inject Javascript code on the User-Agent when logging in.
When an administrator user visits the 'User Sessions' tab, the Javascript will be triggered allowing an attacker to compromise the administrator session.

CVSSv3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSSv3 Base Score: 5.4

Steps to reproduce

  1. Use a Web proxy or a tool to modify the browser User-agent with the following PoC.
    User-Agent: <script>alert('XSS')</script>
  2. Try to login with a non-admin user.
  3. If an admin user visits 'User Management' > 'User Sessions' page, the XSS will be triggered.


A non-admin user may compromise an admin session by exploiting this vulnerability.

Attached below are the links to the advisory and our responsible disclosure policy.


System Information

  • Version: Exponent CMS 2.6.0 patch2.
  • Operating System: Linux.
  • Web Server: Apache
  • PHP Version: 7.4
  • Database and version: Mysql

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