CVE-2026-57726: Themeum Kirki Blind SQL Injection Flaw

CVE-2026-57726 Overview

CVE-2026-57726 is a Blind SQL Injection vulnerability in the Themeum Kirki WordPress plugin, affecting all versions from initial release through 6.0.12. The flaw stems from improper neutralization of special elements used in SQL commands [CWE-89]. Remote unauthenticated attackers can send crafted requests over the network to inject SQL statements. Successful exploitation allows attackers to extract sensitive database contents through inference-based techniques. The vulnerability carries a CVSS score of 9.3 and a scope change, indicating impact extends beyond the vulnerable component itself.

Critical Impact
Unauthenticated remote attackers can execute Blind SQL Injection against WordPress sites running Kirki <= 6.0.12, exposing database contents and enabling downstream compromise.

Affected Products

Themeum Kirki WordPress plugin versions through 6.0.12
WordPress sites with the Kirki Customizer Framework installed
Themes bundling Kirki as a dependency

Discovery Timeline

2026-07-13 - CVE-2026-57726 published to the National Vulnerability Database (NVD)
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-57726

Vulnerability Analysis

The Kirki plugin fails to sanitize user-supplied input before incorporating it into SQL queries. This produces a Blind SQL Injection condition, where attackers infer database contents by observing conditional response differences rather than receiving direct query output. Because the vulnerable endpoint is reachable over the network without authentication and requires no user interaction, exploitation can be scripted at scale. The CVSS vector reports a scope change, meaning the injected SQL operates against data or components beyond the plugin's own security boundary.

Root Cause

The root cause is improper neutralization of special SQL characters (CWE-89) in one or more request-handling paths within Kirki. User-controlled values reach a query builder or raw SQL string without prepared statements or parameter binding. Any attacker-controlled input containing SQL metacharacters is interpreted as query syntax rather than data.

Attack Vector

Attackers deliver malicious payloads through HTTP requests to the vulnerable WordPress endpoint exposed by Kirki. No credentials or user interaction are required. Blind exploitation typically uses boolean-based or time-based techniques such as appending AND SLEEP(5) or AND 1=1 conditions to observe timing or content differences. Automated tools such as sqlmap can enumerate schema, tables, and secrets including wp_users credentials.

Because verified proof-of-concept code has not been published, refer to the Patchstack WordPress Vulnerability advisory for technical details on the affected parameter and request format.

Detection Methods for CVE-2026-57726

Indicators of Compromise

HTTP requests to Kirki plugin endpoints containing SQL metacharacters such as ', ", --, UNION, SLEEP(, or BENCHMARK(.
Unusual spikes in database query latency correlated with inbound requests to /wp-admin/admin-ajax.php or Kirki-registered routes.
Web server access logs showing repeated requests with slight parameter mutations from a single source, characteristic of sqlmap enumeration.
New or modified administrator accounts in wp_users without a corresponding legitimate provisioning event.

Detection Strategies

Deploy Web Application Firewall (WAF) rules that flag SQL injection patterns targeting WordPress plugin parameters, including time-based payloads.
Enable MySQL general query logging or the slow query log to identify anomalous SLEEP, UNION SELECT, or INFORMATION_SCHEMA queries.
Correlate WordPress debug.log errors referencing malformed SQL with the source IP addresses in HTTP access logs.

Monitoring Recommendations

Alert on outbound egress from the web server to unusual destinations following anomalous request patterns, indicating potential data exfiltration.
Monitor for unexpected changes to WordPress options, user roles, and plugin files after suspicious inbound traffic.
Track authentication events for administrator accounts and flag logins from new geolocations or user agents.

How to Mitigate CVE-2026-57726

Immediate Actions Required

Identify all WordPress installations running Kirki <= 6.0.12 by inventorying active plugins across managed sites.
Update Kirki to a fixed release once published by Themeum; consult the Patchstack advisory for current patch status.
Rotate WordPress administrator passwords and database credentials on any site where exploitation is suspected.
Deploy virtual patching through a WAF to block SQL injection payloads targeting Kirki endpoints until the plugin is updated.

Patch Information

At the time of publication, the vulnerability affects all Kirki versions up to and including 6.0.12. Refer to the vendor and the Patchstack WordPress Vulnerability database for the availability of a fixed release.

Workarounds

Disable and remove the Kirki plugin from WordPress installations where updates are not immediately possible.
Restrict access to WordPress admin and AJAX endpoints using IP allowlists at the web server or reverse proxy.
Enforce strict WAF rules that reject requests containing SQL keywords in query parameters handled by the plugin.
Apply least-privilege database credentials to the WordPress database user to limit impact of successful injection.

bash

# Example ModSecurity rule to block common SQLi payloads targeting Kirki endpoints
SecRule REQUEST_URI "@contains kirki" \
    "chain,phase:2,deny,status:403,id:1057726,\
     msg:'Potential CVE-2026-57726 Kirki SQL Injection'"
  SecRule ARGS "@rx (?i)(union(\s|/\*.*\*/)+select|sleep\s*\(|benchmark\s*\(|--\s|;\s*drop\s)" \
    "t:none,t:urlDecodeUni"