Simple Theme Changer <= 1.0 - Cross-Site Request Forgery zu einer beliebigen Konfigurationsänderung des Theme Switchers

An attacker exploiting this CSRF vulnerability can leverage a forged request to alter the Simple Theme Changer plugin's settings. This could involve changing the site's theme, color scheme, or other visual aspects, potentially disrupting the user experience or even injecting malicious code through theme customization options. While the direct impact might seem cosmetic, the ability to modify plugin settings without authentication represents a significant security risk, especially on sites with administrative access controlled by less experienced users. The attack vector relies on social engineering, requiring the attacker to convince an administrator to click a malicious link.

WordPress websites utilizing the Simple Theme Changer plugin, particularly those with less experienced administrators or those lacking robust access control policies, are at risk. Shared hosting environments where multiple websites share the same server resources are also potentially vulnerable, as a compromise on one site could lead to exploitation on others.

• wordpress / composer / npm:

grep -r 'Simple Theme Changer' /var/www/html/wp-content/plugins/
wp plugin list | grep 'Simple Theme Changer'

• generic web:

curl -I https://example.com/wp-admin/admin-ajax.php?action=simple_theme_changer_update_settings&new_setting=value | grep 'X-XSRF-TOKEN'

1. 2025-12-12Disclosure

   disclosure

1. Reserviert2025-12-09
2. Veröffentlicht2025-12-12
3. Geändert2026-04-08
4. EPSS aktualisiert2026-03-23

The primary mitigation for CVE-2025-14391 is to upgrade the Simple Theme Changer plugin to a version that includes proper nonce validation. If upgrading immediately is not feasible due to compatibility issues or testing requirements, consider implementing stricter access controls for plugin settings. Limit access to plugin configuration pages to authorized administrators only. Web Application Firewalls (WAFs) can be configured to detect and block suspicious requests targeting the plugin's update endpoints. Monitor WordPress access logs for unusual activity, particularly requests originating from unfamiliar IP addresses attempting to modify plugin settings.