CVE-2026-6854 in My Calendar Plugin
Summary
by MITRE • 07/08/2026
The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to time-based blind SQL Injection via the 'mc_auth' parameter in all versions up to, and including, 3.7.8 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.
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Analysis
by VulDB Data Team • 07/08/2026
The My Calendar – Accessible Event Manager plugin for WordPress represents a widely used tool for managing calendar events within wordpress environments, yet it harbors a critical vulnerability that exposes installations to sophisticated attack vectors. This vulnerability manifests as a time-based blind sql injection flaw in version 3.7.8 and earlier releases, fundamentally compromising the integrity of affected systems through improper input validation mechanisms.
The technical exploitation occurs through the mc_auth parameter which serves as an entry point for malicious actors to manipulate database queries without proper sanitization or escaping procedures. This parameter fails to implement adequate input filtering, allowing attackers to inject malicious sql payloads that exploit the existing query structure. The vulnerability operates under a time-based blind injection methodology where attacker-controlled sql commands are executed in the background, with response timing indicating successful query execution and data extraction capabilities.
The operational impact of this vulnerability extends beyond simple data theft, as unauthenticated attackers can leverage this weakness to extract sensitive information from the wordpress database including user credentials, configuration details, and potentially other administrative data. The lack of proper sql query preparation means that existing queries become susceptible to manipulation through appended sql commands, creating a pathway for comprehensive database reconnaissance and exploitation. This vulnerability directly aligns with common weakness enumeration cwe-89 which categorizes improper neutralization of special elements used in sql commands as a primary vector for sql injection attacks.
The implications of this vulnerability are particularly severe in wordpress environments where plugins often maintain elevated privileges and access to sensitive user data. Attackers can utilize this time-based blind injection technique to systematically extract information without direct feedback, making detection more challenging while simultaneously increasing the potential damage scope. The vulnerability's persistence across multiple versions indicates a fundamental flaw in input handling that requires immediate remediation.
Security mitigations for this vulnerability should include immediate patching of the plugin to version 3.7.9 or later where proper input sanitization has been implemented. Organizations should also implement web application firewalls with sql injection detection capabilities and conduct thorough security audits of all installed plugins. Additional protective measures include restricting access to administrative functions, implementing strong input validation at multiple layers, and monitoring database query logs for unusual patterns that may indicate exploitation attempts. The attack surface can be reduced by ensuring proper authentication mechanisms and limiting plugin functionality to required permissions only.
This vulnerability demonstrates the critical importance of proper input validation and sql query preparation in web applications, particularly within content management systems where plugins often extend functionality while potentially introducing security weaknesses. The absence of parameterized queries and insufficient escaping procedures creates a fundamental breach in application security that can be exploited by attackers with minimal technical expertise to achieve significant data compromise.
References to established security frameworks show this vulnerability mapping directly to attack techniques described in the mitre att&ck framework under database persistence and credential access categories, where adversaries leverage sql injection vulnerabilities to maintain long-term access and extract sensitive information from target databases. The weakness exemplifies how seemingly minor input validation failures can create major security implications in complex web application environments where multiple layers of security must work in concert to protect against sophisticated attack vectors.