CVE-2020-15159
HIGH7.6EPSS 1.6%Cross Site Scripting and RCE in baserCMS
Published: 8/28/2020Modified: 3/14/2026
Also known as:GHSA-673x-f5wx-fxpw
Description
baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). * Impact: XSS to RCE via Arbitrary file upload. * Attack vector is: Administrator must be logged in. * Components are: ThemeFilesController.php, UploaderFilesController.php. * Tested baserCMS Version : 4.3.6 (Latest) * Affected baserCMS Version : 4.2.0 ~ 4.3.6 (XSS), 3.0.10 ~ 4.3.6 (RCE) * Patches : https://basercms.net/security/20200827 Found by Vulnerability Research team in [Flatt Security Inc.](https://flatt.tech/)
Affected packages (1)
- Packagist/baserproject/basercms>= 4.0.0, < 4.3.7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.6 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H |