CVE-2020-15155 Cross-Site Scripting in baserCMS
An attacker with admin access can execute arbitrary scripts via XSS in baserCMS, potentially compromising the site.
- 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-2020-15155?
CVE-2020-15155 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) via arbitrary script execution. Admin access is required to exploit this vulnerability. The affected components is toolbar.php. The issue is fixed in version 4.3.7.
Weakness: CWE-79
Which versions are affected by CVE-2020-15155?
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-2020-15155?
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-2020-15155 being exploited?
There is no known exploitation of CVE-2020-15155 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-4r3m-j6x5-48m3.