CVE-2026-2511 Overview
The JS Help Desk – AI-Powered Support & Ticketing System plugin for WordPress contains a SQL Injection vulnerability in the storeTickets() function via the multiformid parameter. This flaw affects all versions up to and including 3.0.4 and allows unauthenticated attackers to manipulate database queries to extract sensitive information.
The vulnerability arises from improper use of WordPress's esc_sql() function. While the user-supplied multiformid value is passed through esc_sql(), the escaped result is not enclosed in quotes within the SQL query. This renders the escaping ineffective against SQL injection payloads that do not contain quote characters, enabling attackers to append malicious SQL queries.
Critical Impact
Unauthenticated attackers can extract sensitive information from the WordPress database, including user credentials, ticket data, and other confidential information stored by the help desk plugin.
Affected Products
- JS Help Desk – AI-Powered Support & Ticketing System plugin for WordPress versions up to and including 3.0.4
- WordPress installations using vulnerable versions of the js-support-ticket plugin
Discovery Timeline
- 2026-03-26 - CVE CVE-2026-2511 published to NVD
- 2026-03-26 - Last updated in NVD database
Technical Details for CVE-2026-2511
Vulnerability Analysis
This SQL Injection vulnerability (CWE-89) exists in the storeTickets() function within the JS Help Desk plugin. The core issue stems from a common developer mistake when using WordPress's sanitization functions: while esc_sql() properly escapes special characters, it does not automatically quote the value being inserted into the query.
When the multiformid parameter is processed, the code applies esc_sql() to sanitize the input but fails to wrap the result in quotes within the SQL statement. An attacker can exploit this by crafting payloads that avoid quote characters entirely, using techniques such as numeric injection, UNION-based injection with hex-encoded strings, or conditional blind SQL injection methods.
The vulnerability is accessible without authentication, significantly increasing its exploitability. Network-based attacks require no user interaction, allowing remote attackers to systematically extract database contents.
Root Cause
The root cause is improper implementation of SQL input sanitization. The esc_sql() function in WordPress is designed to escape special characters in strings before they are used in SQL queries. However, this function assumes the escaped value will be placed within quotes in the SQL statement. When the multiformid value is inserted into the query without surrounding quotes, attackers can inject SQL syntax using payloads that rely on numeric or boolean logic rather than string literals.
The vulnerable code can be examined at multiple locations within the plugin:
Attack Vector
The attack vector is network-based, requiring no authentication or user interaction. An attacker targets the multiformid parameter in requests to the storeTickets() function endpoint. By supplying crafted numeric or boolean-based SQL injection payloads, the attacker can manipulate the underlying query logic.
Common exploitation techniques for this type of unquoted integer injection include:
- UNION-based injection: Appending UNION SELECT statements to retrieve data from other tables
- Boolean-based blind injection: Using conditional statements (e.g., 1 AND 1=1 vs 1 AND 1=2) to infer database contents
- Time-based blind injection: Using SLEEP() or BENCHMARK() functions to confirm injection success
Since the vulnerability specifically requires payloads without quote characters, attackers typically use functions like CHAR() or hexadecimal encoding to construct string values needed for data extraction.
Detection Methods for CVE-2026-2511
Indicators of Compromise
- Unusual database query patterns in WordPress logs, particularly involving the storeTickets() endpoint
- Web server access logs showing requests with abnormal multiformid parameter values containing SQL keywords (UNION, SELECT, OR, AND)
- Database audit logs indicating unauthorized SELECT queries against sensitive tables
- Unexpected spikes in database load or query execution times potentially indicating time-based injection attempts
Detection Strategies
- Configure Web Application Firewall (WAF) rules to detect SQL injection patterns in the multiformid parameter
- Implement database activity monitoring to alert on queries with anomalous structures or accessing sensitive tables
- Deploy endpoint detection solutions capable of identifying malicious HTTP requests targeting WordPress plugin endpoints
- Enable verbose MySQL query logging temporarily to audit requests to affected endpoints
Monitoring Recommendations
- Monitor web application logs for requests to /wp-admin/admin-ajax.php and related ticket submission endpoints with suspicious parameter values
- Set up alerting for database queries containing injection signatures such as UNION SELECT, INFORMATION_SCHEMA, or conditional sleep functions
- Implement rate limiting on ticket submission endpoints to slow automated exploitation attempts
- Review WordPress security plugins for SQL injection detection capabilities and ensure they are properly configured
How to Mitigate CVE-2026-2511
Immediate Actions Required
- Update the JS Help Desk plugin to version 3.0.5 or later immediately
- If immediate update is not possible, disable the JS Help Desk plugin until patching is complete
- Review database access logs for signs of exploitation or data exfiltration
- Consider implementing a WAF rule to block requests containing suspicious multiformid values
- Audit any sensitive data that may have been accessible through the WordPress database
Patch Information
The vulnerability has been addressed in the plugin update available through the WordPress plugin repository. The fix can be reviewed in WordPress Changeset #3463031, which properly implements parameterized queries or ensures quoted value placement in SQL statements.
Additional technical analysis is available from Wordfence Vulnerability Analysis.
Workarounds
- Disable the JS Help Desk plugin entirely until the update can be applied
- Implement a Web Application Firewall (WAF) rule to sanitize or block the multiformid parameter containing SQL keywords
- Restrict access to ticket submission functionality to authenticated users only via WordPress access controls
- Use database-level prepared statements through custom code modifications if the vendor patch cannot be applied
# Example .htaccess rule to block suspicious multiformid values
# Add to WordPress root .htaccess as temporary mitigation
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} multiformid=.*(\bunion\b|\bselect\b|\bfrom\b|\bwhere\b|\bor\b|\band\b) [NC]
RewriteRule .* - [F,L]
</IfModule>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
