CVE-2026-11590: WP Support Plus SQL Injection Vulnerability – HIGH Risk Unauthenticated Attack

Technical summary

CVE-2026-11590 is a SQL injection vulnerability in WP Support Plus Responsive Ticket System plugin versions through 9.1.2. The vulnerability exists because the plugin fails to sanitize user-supplied array keys before incorporating them into SQL statements. This allows unauthenticated attackers to bypass input validation and inject arbitrary SQL commands. The attack requires no privilege escalation or user interaction, making it a critical attack surface for public-facing WordPress installations. The CVSS 3.1 vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N) reflects network accessibility, low attack complexity, no authentication requirement, and high confidentiality impact with cross-system scope.

Business impact

Organizations using this plugin face direct risk of data breach. Attackers can extract sensitive customer information, staff credentials, and internal communications from support tickets without triggering authentication logs or alerts. For service providers, a compromise could expose client data and erode trust. Remediation delays increase exposure window; every day the plugin remains unpatched is a day attackers could be exploiting undetected. Incident response costs, potential regulatory fines under GDPR or similar frameworks, and reputational damage are secondary but significant concerns.

Affected systems

WP Support Plus Responsive Ticket System plugin version 9.1.2 and earlier versions are vulnerable. Any WordPress installation running these versions with the plugin enabled is affected. The vulnerability is unauthenticated and network-accessible, so any public-facing WordPress site is at risk regardless of access controls or network segmentation, unless the plugin is disabled or removed.

Exploitability

This vulnerability is highly exploitable. It requires no authentication, has low attack complexity, and is remotely accessible over the network. No user interaction or special conditions are needed. Public exploit code or proof-of-concept demonstrations may already exist or appear quickly given the straightforward nature of SQL injection. Automated vulnerability scanners can likely detect vulnerable installations. The threat level is immediate and should be treated as actively exploitable.

Remediation

Update WP Support Plus Responsive Ticket System to a patched version released after 9.1.2. Verify the exact patched version number in the official plugin repository or vendor advisory. If an immediate patch is unavailable, disable and deactivate the plugin until a fix is released. For high-risk environments, consider temporarily removing the plugin or implementing database-level access controls and Web Application Firewall (WAF) rules to block SQL injection patterns.

Patch guidance

Check the official WordPress plugin directory and the vendor's advisory for the available patched version. Update through the WordPress admin dashboard (Plugins > Installed Plugins > WP Support Plus Responsive Ticket System > Update) or manually upload the latest version. Test the update in a staging environment before production rollout to confirm compatibility with your WordPress version and other plugins. Verify in the plugin settings that no malicious data was inserted during the exposure window.

Detection guidance

Review database query logs and web server access logs for unusual SQL patterns, especially those containing UNION, SELECT, DROP, or other SQL keywords in user-supplied parameters. Monitor HTTP requests to the plugin's admin endpoints for signs of exploitation attempts. Implement or review database activity monitoring (DAM) tools to detect anomalous queries. Check for unauthorized user accounts or privilege escalations in WordPress user tables. If you have Web Application Firewall (WAF) logs, search for SQL injection attack signatures in the plugin's handler endpoints.

Why prioritize this

This vulnerability scores 8.6 (HIGH) due to unauthenticated remote SQL injection with high confidentiality impact and cross-system scope. No authentication or user interaction is required, making it immediately exploitable by any attacker. The widespread deployment of WordPress and plugin popularity increase the number of potential victims. The vulnerability is not yet on the CISA Known Exploited Vulnerabilities (KEV) catalog, but its nature suggests rapid adoption of exploit techniques is likely. Immediate patching is warranted.

Risk score, explained

The CVSS 3.1 score of 8.6 reflects: Network accessibility (AV:N) allows remote exploitation; Low attack complexity (AC:L) means no special conditions or tools are needed; No authentication required (PR:N) makes it accessible to unauthenticated users; No user interaction (UI:N) means the attacker doesn't need to trick anyone; Cross-system scope (S:C) indicates impact beyond the vulnerable component; High confidentiality impact (C:H) means sensitive data exposure is possible; Integrity and availability are not impacted (I:N, A:N). This combination places it in the HIGH severity category and warrants immediate attention.

Frequently asked questions