Authentication Abuse

XML-RPC Brute Force Attack

Attackers abuse xmlrpc.php to attempt password attacks or amplify login attempts against WordPress.

Symptoms

These are common signs associated with this type of WordPress compromise. The exact behavior can vary by hosting setup, cache layer, plugins and how the attacker configured the payload.

• High server load or many POST requests to xmlrpc.php.
• Login security tools report repeated attempts.
• Hosting resources spike without normal traffic growth.

Technical overview

XML-RPC is a legitimate WordPress endpoint, but it can be abused when exposed without rate limiting or strong authentication.

Important: visible symptoms are rarely the whole incident. A safe recovery should identify both the payload and the persistence mechanism that allowed it to run.

Indicators of compromise

During investigation, these indicators are commonly reviewed. They do not prove compromise alone, but they help map scope and root cause.

Investigation process

WP•FIX treats this as an incident, not a simple file deletion task. The review normally includes WordPress core integrity, theme and plugin files, uploads, database options, users, cron events, redirects, cache layers and the most likely entry point.

Recovery process

• Create a safe recovery point before changing production data.
• Remove malicious files, scripts, database payloads and persistence mechanisms.
• Replace compromised components with clean versions where appropriate.
• Review administrator users, credentials and access paths.
• Harden the site and document the recovery path.

Prevention

Prevention depends on the root cause. Common controls include removing nulled components, updating vulnerable plugins, reducing administrator access, hardening login paths, adding monitoring and keeping verified backups.

FAQ