CVE-2020-15159 Cross Site Scripting leading to RCE in baserCMS
An authenticated administrator can upload malicious scripts via XSS to achieve remote code execution in baserCMS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-15159?
CVE-2020-15159 is a high-severity cross-site scripting vulnerability in Basercms Basercms, published on 28 Aug 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.
Weakness: CWE-79
Which versions are affected by CVE-2020-15159?
2 open source packages ship an affected version, including baserproject/basercms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
baserproject/basercms Packagist | From 4.0.0 | 4.3.7 |
baserproject/basercms Packagist | From 4.0.0 | 4.3.7 |
Products include Basercms Basercms.
How do I fix CVE-2020-15159?
Upgrade baserproject/basercms to 4.3.7 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-15159 being exploited?
There is no known exploitation of CVE-2020-15159 in the wild and no public exploit code.
Other vulnerabilities in Basercms Basercms
- CVE-2023-25654 baserCMS File Uploader Remote Code Execution (RCE) vulnerability
- CVE-2023-25655 baserCMS allows any file to be uploaded
- CVE-2017-10842 baserCMS SQL Injection vulnerability
- CVE-2026-30880 baserCMS: OS command injection vulnerability in installer
- CVE-2026-21861 baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
Sources
Also known as GHSA-673x-f5wx-fxpw.