Immediate mitigations — what to do in the next 60 minutes

If you operate sites with Tooltips ≤ 10.7.9, take these steps now. Prioritise actions according to your operational constraints.

1. Assess exposure: identify which sites have the plugin installed and the plugin version. List pages and posts using tooltip shortcodes or blocks.
2. If feasible, disable the plugin: the safest immediate measure is deactivation until a vendor patch is available. If the plugin is essential, apply the mitigations below.
3. Restrict Contributor and higher privileges: temporarily reduce or audit accounts with Contributor and higher roles. Reset passwords and force reauthentication for contributors if compromise is suspected.
4. Remove or sanitise untrusted tooltip content: audit tooltip entries for suspicious HTML or scripts. Remove tooltip content that contains angle brackets (< or >), javascript: URIs, or attributes like onerror/onload. If tooltip content is stored in meta fields or custom post types, consider export + bulk sanitisation.
5. Harden input saving where possible: if you can edit plugin behaviour quickly, enforce server‑side sanitisation before saving tooltip content. Use WordPress functions such as wp_kses() with a strict allowed HTML set or sanitize_text_field() for plaintext only.
6. Add a Content Security Policy (CSP): a restrictive CSP can reduce the impact of many XSS attacks (for example by disallowing inline scripts). Example header (test carefully for compatibility):

   Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; report-uri /csp-report-endpoint;

7. Monitor logs and browser console errors: watch webserver access logs, application logs, and admin activity for anomalies — especially edits from Contributor accounts.
8. Apply virtual patching or input filtering: use request‑level controls (WAF, reverse proxy or application filters) to block or sanitise obvious exploit payloads targeting tooltip save endpoints. See the WAF guidance and sample rules below.
9. Backup now: take immediate backups of files and database so you can restore if needed.

If you use a managed security provider or host that offers application filtering, engage them and provide site details so they can help with protective controls and monitoring.

How a Web Application Firewall (WAF) or request‑filtering should protect you now

A network or application‑level filtering control can mitigate exploitation rapidly when a code patch is not yet available. Recommended approaches:

• Create targeted rules: identify the HTTP endpoints that save tooltip content (admin POST endpoints, admin‑ajax, REST endpoints) and validate/sanitise inputs there.
• Block obvious XSS patterns: deny submissions containing
• Protect rendered responses: where feasible, prevent response bodies from containing suspicious attributes or inline scripts for pages that render tooltips.
• Rate‑limit or challenge contributors: apply stricter rate limits, additional verification, or CAPTCHA for accounts creating tooltip content.
• Test rules in monitoring mode first: to avoid false positives that could block legitimate content, run new rules in learn/log mode before full blocking.

Virtual patching rules (examples for operators)

These pseudo‑rules are guidance for teams operating WAFs, reverse proxies, or request filters. Test them in staging before deploying to production.

- Rule 1: Block script tags in tooltip submissions
  Condition: Request path matches tooltip save endpoint AND request body contains regex /<\s*script/i
  Action: Block and log

- Rule 2: Block event handler attributes
  Condition: Request body contains regex /\son[a-z]+\s*=/i  (captures onload=, onerror=, onclick=)
  Action: Challenge (CAPTCHA) OR block

- Rule 3: Block javascript: and data: URIs
  Condition: Request body contains regex /(javascript|data):\s*/i
  Action: Block and log

- Rule 4: Monitor suspicious encoding
  Condition: Request body contains long sequences of %3C or %3E or eval\( — indicating encoded payloads
  Action: Log with high priority and block if repeated or paired with suspicious accounts

Combine pattern checks with reputation (IP reputation), account role (Contributor vs Admin), and behavioural heuristics (sudden bulk edits) to reduce false positives.

Detection and incident response

If you suspect an XSS attempt or successful exploitation, follow this incident playbook.

1. Containment

• Deactivate the Tooltips plugin if you suspect active exploitation.
• Temporarily revoke Contributor editing rights or restrict access to tooltip editing UIs.

2. Preservation

• Create a full backup of files and database (do not overwrite logs).
• Preserve logs: webserver access logs, application logs, and any filtering appliance logs showing matched payloads.

3. Triage & investigation

• Search stored tooltip entities for suspicious patterns (
• Identify the originating accounts and their IP addresses.
• Check for suspicious logins, password resets, or unusual admin activity.

4. Remediation

• Remove or sanitise malicious tooltip entries.
• Rotate credentials and reset sessions for accounts that may be compromised.
• Apply request‑level filters or virtual patches to block further attempts.

5. Recovery

• Reopen functionality only after confirming remediation and monitoring for recurrence.
• Consider staged reactivation: enable the plugin in a maintenance window and observe logs closely.

6. Post‑incident

• Review privilege assignments and tighten role allocations.
• Train contributors on safe content practices (avoid pasting HTML, external scripts).
• Subscribe to plugin security notifications and patch promptly when updates are released.

Developer guidance: how to fix the plugin (for maintainers or developers)

If you maintain the plugin or a custom fork, fix the root cause rather than only mitigating at the edge.

1. Identify sinks: locate every place tooltip content is rendered (PHP templates, JS templates, REST responses).
2. Apply output encoding: for HTML body use esc_html() or wp_kses_post() with strict whitelist; for attributes use esc_attr(). Avoid placing untrusted content in event handler attributes.
3. Avoid innerHTML and unsafe DOM operations: use textContent or properly encoded setAttribute. If HTML is required, sanitise server‑side and strip event handlers and scriptable URIs.
4. Use WordPress sanitisation APIs: apply wp_kses() on save with a strict allowed tags/attributes list, or sanitize_text_field() for plaintext fields.
5. Add logging and alerts: log attempts to save disallowed content and notify administrators where appropriate.
6. Audit other plugin functionality: ensure REST endpoints and AJAX handlers check capabilities and verify nonces (current_user_can checks should be appropriate and granular).

If you are a plugin developer, coordinate with a security reviewer and publish a fixed release with clear release notes so site owners can respond quickly.

Hardening WordPress to reduce XSS risk

• Principle of least privilege: assign minimum roles and avoid giving Contributor or Editor roles unnecessarily.
• Sanitise user input: all HTML‑accepting fields must be sanitised server‑side on save.
• Escape all output: use esc_html(), esc_attr(), esc_url() consistently in themes and plugins.
• Content Security Policy: correctly implemented CSP reduces the impact of many XSS chains.
• Request‑level filtering: WAFs or proxies that perform targeted filtering can block many exploit attempts.
• Regular scanning: perform automated scans for XSS and OWASP Top 10 issues.
• Backups and restore testing: ensure backups are taken regularly and restores are tested.
• Audit plugins: remove unused plugins and prefer actively maintained components.
• Logging and anomaly detection: centralise logs and look for spikes in edits, new users, or suspicious POST payloads.

Example detection queries and checks

Useful searches for stored tooltip content. Adapt to your environment and test carefully.

-- Example SQL search (adjust table prefix as needed)
SELECT * FROM wp_postmeta
WHERE meta_key LIKE '%tooltip%'
  AND meta_value LIKE '%