Description
Drupal Core is prone to an arbitrary file overwrite vulnerability. This can be coupled with other existing vulnerabilities to affect the vulnerable application in various ways. Drupal Core versions 8.9.x ranging from 8.9.0 and up to and including 8.9.12 are vulnerable.
Remediation
Update to Drupal Core version 8.9.13 or latest
References
Related Vulnerabilities
WordPress Plugin iThemes Security (formerly Better WP Security) Cross-Site Scripting (5.6.1)
WordPress Plugin Crayon Syntax Highlighter 'wp_load' Parameter Remote File Include (1.12.1)
Drupal Improper Input Validation Vulnerability (CVE-2018-7600)
WordPress Plugin FV Flowplayer Video Player Cross-Site Scripting (6.0.3.3)
WordPress Plugin NEX-Forms-The Ultimate WordPress Form Builder Security Bypass (7.8.7)