Executive brief
The Link Library plugin for WordPress contains a file deletion vulnerability that allows unauthenticated attackers to delete critical website files such as wp-config.php. An attacker can submit malicious links with arbitrary file paths; when a site administrator deletes these links using the plugin's optional file deletion feature, the attacker's specified files are removed. This can lead to website defacement, data loss, or remote code execution.
Technical details
The vulnerability exists in the ll_delete_link_fields function within the Link Library plugin, where file path validation is insufficient. When the plugin's 'Delete local file on link deletion' option is enabled (disabled by default), an attacker can craft a link entry with a malicious file path that bypasses path validation checks. The attack requires an administrator to perform the routine action of permanently deleting the attacker-submitted link through the WordPress admin interface. Upon deletion, the plugin will remove the specified file from the server without proper sanitization, potentially including critical files like wp-config.php.
Affected products
- Link Library Link Library up to 7.9.4
Timeline
- 2026-08-15: disclosed
- 2026-08-15: advisory: CVE-2026-18855