Regex to detect javascript: or data: schemes in URL fields

(?i)^\s*(javascript:|data:|vbscript:)

Allowlist approach — only permit http(s) image URLs

# Allow only http(s) URLs that end in common image extensions
SecRule ARGS:get_avatar|ARGS:profile_picture|ARGS:avatar "(?i)^(https?://[^\s'\"<>]+(\.jpg|\.jpeg|\.png|\.gif|\.webp)(\?.*)?)$" "allow,log,msg:'Valid avatar URL'"
SecRule ARGS:get_avatar|ARGS:profile_picture|ARGS:avatar "." "deny,log,msg:'Avatar URL invalid or potentially harmful'"

# Notes:
# - Start rules in monitoring mode to capture false positives.
# - Target only profile update endpoints to avoid broader disruptions.
# - Ensure legitimate Gravatar or non-image workflows are allowed if required.

Best practices for WAF rules:

• Start in detection/monitoring mode and review logs before enabling blocking.
• Scope rules narrowly to profile update endpoints and known form fields.
• Log blocked requests with context (IP, user ID, payload snippet) to support incident response.

Hardening WordPress (beyond WAF)

Use this incident as an opportunity to reduce the impact of similar issues:

• Principle of least privilege: Limit Subscriber role capabilities; avoid granting unnecessary edit rights.
• Sanitize and escape: Validate inputs and escape on output. Use esc_url_raw(), esc_url(), esc_attr(), esc_html() appropriately.
• Disable open registration: Turn off "Anyone can register" unless needed.
• User hygiene: Enforce strong passwords and enable multi-factor authentication (MFA) for privileged accounts.
• Review theme/template output: Ensure themes escape user metadata correctly — theme output often determines exploitability.
• Audit plugins and authors: Remove unused plugins and favour actively maintained code.
• Logging and monitoring: Record admin actions and changes to user profiles; use file integrity monitoring for unexpected changes.

Incident response — steps if you find exploitation evidence

1. Isolate: Deactivate the vulnerable plugin and consider putting the site into maintenance mode if the incident is severe.
2. Contain: Remove malicious stored values from the database, reset credentials for affected accounts, and terminate active sessions for all users if needed.
3. Investigate: Review access logs, admin action logs and perimeter logs for the timeframe of the injection. Look for lateral movement: new admin users, modified files, or unexpected plugin changes.
4. Remediate: Apply code fixes, remove or replace the vulnerable plugin, restore from a clean backup if required, and harden templates and inputs.
5. Notify: Inform impacted users and stakeholders if data or accounts were affected; follow local disclosure and notification laws applicable in your jurisdiction.
6. Review: Conduct a post-incident review and implement long-term controls (MFA, stricter role capabilities, periodic plugin audits).

If you need professional incident response, engage an experienced security provider or a forensic team to triage and remediate the compromise.

Short checklist (practical)

• Deactivate Easy Author Image if feasible.
• Restrict Subscribers from editing profile fields if deactivation is not possible.
• Search and sanitize suspicious profile picture URL values in usermeta.
• Apply narrowly scoped WAF rules in monitor mode, then tune before blocking.
• Audit registrations and remove suspicious Subscriber accounts.
• Enforce MFA for admin accounts and rotate credentials if compromise is suspected.
• Monitor logs for repeated attempts from the same IP, UA, or account.

Example detection queries and remediation commands

Database check for suspicious values:

SELECT user_id, meta_key, meta_value
FROM wp_usermeta
WHERE meta_key LIKE '%avatar%' OR meta_key LIKE '%picture%' OR meta_key LIKE '%profile%';

Search for script tags:

SELECT * FROM wp_usermeta WHERE meta_value LIKE '%

# Example replaces '

$avatar_url = get_user_meta( $user_id, 'profile_picture', true );
$avatar_url = esc_url( $avatar_url );
echo '';

SecRule ARGS_NAMES|ARGS "(avatar|profile_picture|picture|photo)" "chain,deny,status:403,log,msg:'Block avatar field javascript: scheme'"
  SecRule ARGS "(?i)^\s*javascript:"

SecRule REQUEST_BODY "(?i)(%3Cscript%3E|%3C%2Fscript%3E|%3Csvg|%3Conerror%3D|%3Cimg%20src%3D)" "deny,log,status:403,msg:'Encoded script tag in POST body detected'"

SecRule ARGS|get_avatar|ARGS:profile_picture "(?i)^(https?://[^\s'\"<>]+(\.jpg|\.jpeg|\.png|\.gif|\.webp)(\?.*)?)$" "id:1001,allow"
SecRule ARGS|get_avatar|ARGS:profile_picture "." "id:1002,deny,log,msg:'Avatar URL denied — only http/https image URLs allowed'"