What’s Vulnerable › Vulnerabilities

CVE-2020-15159: Cross Site Scripting leading to RCE in baserCMS

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-28 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• baserproject basercms: through 4.3.6

References

• https://basercms.net/security/20200827
• https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d
• https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw
• https://basercms.net/security/20200827
• https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d
• https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw

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