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CVE-2026-8441 – Unauthenticated SQL Injection – WP Review Slider Pro WordPress Plugin ≤ 12.7.2

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Summary

CVE-2026-8441 is a high-severity unauthenticated SQL injection vulnerability affecting the WP Review Slider Pro plugin for WordPress, in all versions up to and including 12.7.2. The flaw allows any remote, unauthenticated attacker who can reach a page hosting the plugin to extract arbitrary data from the underlying WordPress database via blind, time-based injection. It carries a CVSS v3.1 base score of 7.5 (HIGH).

Technical details

  • Root cause: The wprp_load_more_revs AJAX action reads a user-supplied value from $_POST['notinstring'] and passes it through sanitize_text_field(), which strips HTML tags and whitespace but provides no SQL safety. The sanitized value is then concatenated directly into an unquoted numeric AND id NOT IN (...) SQL clause and executed via $wpdb->get_results() without $wpdb->prepare() or intval() casting.
  • Why standard protections fail: Because the injection point sits in an unquoted numeric context, WordPress’s wp_magic_quotes mechanism — which escapes embedded quotes — is entirely ineffective.
  • Attack vector: The AJAX hook is registered via wp_ajax_nopriv_wprp_load_more_revs, meaning WordPress processes the action without any authentication check. The nonce required by check_ajax_referer is broadcast publicly through wp_localize_script on any frontend page that renders the plugin’s shortcode. An attacker needs only to visit such a page, harvest the nonce from the page source, and submit a crafted POST request to /wp-admin/admin-ajax.php.
  • Exploitation technique: Blind and time-based SQL injection; no error output from the server is required.
  • Impact: Full read access to the WordPress database, including user credentials, session tokens, private post content, and any other stored data.

Affected software

  • WP Review Slider Pro (WordPress plugin) — all versions up to and including 12.7.2

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CWE: CWE-89 – Improper Neutralization of Special Elements used in an SQL Command

Mitigation and recommended actions

  • Immediate: No patched version of WP Review Slider Pro was confirmed in the CVE record at time of publication. Site owners should contact the plugin vendor at wpreviewslider.com and apply any security release that addresses this vulnerability as soon as one is made available.
  • Workaround (if patch unavailable): Deactivate the WP Review Slider Pro plugin until a confirmed security update is applied. This eliminates the vulnerable AJAX endpoint entirely.
  • Network mitigation: If deactivation is not feasible, use a web application firewall (WAF) rule to block POST requests to wp-admin/admin-ajax.php containing action=wprp_load_more_revs from untrusted sources, and restrict access to the endpoint at the network layer where possible.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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