CVE-2026-12937: SQL Injection in Tourfic Plugin

How to Detect Exploitation Attempts

Detection should start with the WordPress AJAX surface. Specifically, review web server logs, WAF telemetry, and application monitoring for requests to /wp-admin/admin-ajax.php where the action parameter equals tf_room_availability. From there, pivot on suspicious post_id values, repeated failed requests, bursts from a single IP, and requests that include SQL metacharacters or common extraction patterns.

You should also correlate web requests with downstream database anomalies. If you have MySQL or MariaDB logging enabled, inspect for unusual query failures, syntax errors, or sudden spikes in read-heavy activity tied to the web application account. Because the exact query structure was not available, defenders should not rely on one database error signature. Instead, combine weak signals: public page fetches for hotel templates, nonce retrieval patterns, followed by repeated admin-ajax.php submissions with malformed post_id values.

Technical Notes

A simple Apache or Nginx log triage pattern is to search for the vulnerable action first:

grep -E "admin-ajax\.php" /var/log/nginx/access.log* | grep "tf_room_availability"

Then narrow on obviously malformed post_id values:

grep -E "admin-ajax\.php" /var/log/nginx/access.log* | \
grep "tf_room_availability" | \
grep -E "post_id=.*('|%27|--|%2D%2D|/\*|%2F%2A|union|select|sleep\(|benchmark\()"

A basic Splunk query defenders can adapt:

index=web_logs uri_path="*/wp-admin/admin-ajax.php"
| search uri_query="*action=tf_room_availability*" OR request_body="*action=tf_room_availability*"
| regex _raw="post_id=.*(%27|'|--|/\*|union|select|sleep\(|benchmark\()"
| stats count min(_time) as firstSeen max(_time) as lastSeen by src_ip, http_user_agent, host

A generic Suricata-style HTTP signature concept for tuning, not copy-paste production use:

alert http any any -> $HOME_NET any (
  msg:"Possible Tourfic tf_room_availability SQLi attempt";
  flow:to_server,established;
  http.uri; content:"/wp-admin/admin-ajax.php";
  http.client_body; content:"action=tf_room_availability";
  http.client_body; pcre:"/post_id=.*(?:'|%27|--|union|select|sleep\()/i";
  sid:100012937;
  rev:1;
)

If you do not have adequate logs, assume visibility is incomplete. In that case, prioritize patching and consider the possibility that attempts may have gone unnoticed.

Mitigation and Patching

The primary mitigation is straightforward: upgrade Tourfic to a version newer than 2.22.7, ideally the latest available release. Because the exact first fixed version was not verified from the retrieved vendor or WordPress sources, do not stop at a minimally newer build unless you have independently confirmed the changelog. Updating to the latest release reduces uncertainty and may also pull in unrelated security fixes.

If immediate patching is not possible, reduce exposure around the vulnerable AJAX path. That may include temporarily disabling the plugin, restricting access to hotel booking pages if business impact allows, or using a WAF rule to inspect admin-ajax.php requests containing action=tf_room_availability and suspicious post_id input. Temporary controls are compensating measures only. Because the nonce is publicly obtainable according to NVD, relying on nonce-based protections alone is not a mitigation.

Technical Notes

To verify the installed plugin version with WP-CLI:

wp plugin list | grep tourfic

To update the plugin with WP-CLI:

wp plugin update tourfic

To confirm the plugin is now above the vulnerable range:

wp plugin get tourfic --fields=name,status,version,update_version

If you need an emergency workaround before patching and can tolerate service impact, temporarily deactivate the plugin:

wp plugin deactivate tourfic

If you run a WAF or reverse proxy, a temporary blocking condition could target requests meeting all of these criteria:

• Path contains /wp-admin/admin-ajax.php
• Body contains action=tf_room_availability
• post_id contains SQL metacharacters or SQL keywords

That workaround may reduce exploitation attempts, but it can also create false positives or break booking functionality. Test in staging where possible.

Incident Response Considerations

If you suspect exploitation, do not limit response to web logs. Treat this as a potential database disclosure event. Depending on site usage, impacted data could include WordPress users, password hashes, booking records, customer contact data, and site configuration details. Start by preserving logs, collecting the current plugin version, and identifying the earliest suspicious request to the vulnerable AJAX action.

You should also review whether the site stores sensitive personal or payment-adjacent data in WordPress tables or plugin-specific tables. Rotate database credentials if compromise is suspected, reset WordPress admin credentials where appropriate, and inspect for follow-on activity such as new admin users, modified plugin files, unknown cron jobs, or dropped web shells. Even though this CVE is described as data extraction-focused, SQL injection can serve as an entry point for broader post-exploitation depending on environment and permissions.

References