CVE-2026-115302 in Contact Form by Supsystic Plugin
Summary
by MITRE • 10/29/2026
The Contact Form by Supsystic WordPress plugin before 1.11.1 does not restrict access to an AJAX action that deletes stored form statistics records, allowing unauthenticated attackers to delete arbitrary statistics entries.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified in the Contact Form by Supsystic WordPress plugin prior to version 1.11.1 represents a critical failure in server-side access control mechanisms within the application's AJAX handler architecture. Specifically, the flaw resides in an endpoint designed for administrative tasks, namely the deletion of stored form statistics records. In secure web applications, actions that modify or destroy data must be protected by robust authentication and authorization checks to ensure that only privileged users can execute them. However, this particular implementation fails to verify whether the incoming request originates from a legitimate administrator session or possesses valid security tokens. This oversight creates an unrestricted function path where any actor with network connectivity to the vulnerable WordPress instance can trigger the deletion routine without providing credentials or passing standard nonces required for state-changing operations in modern web frameworks.
From a technical perspective, this deficiency aligns closely with CWE-284, which describes Improper Access Control, and more specifically reflects aspects of CWE-601 regarding URL Redirection to Untrusted Destination if the deletion logic is coupled with other flaws, though here it primarily manifests as an unauthorized state change. The attacker exploits this by crafting a specific HTTP request targeting the AJAX action endpoint associated with statistics management. Because the server does not validate the user's role or session integrity before processing the delete command, the malicious payload executes successfully on the backend database layer. This allows for the remote and unauthenticated removal of historical data regarding form submissions, which are often critical for business intelligence, customer relationship management, and compliance auditing within organizations relying on this plugin to capture leads or feedback.
The operational impact of this vulnerability extends beyond mere data loss; it compromises the integrity and availability of information systems that depend on accurate record-keeping. An unauthenticated attacker can perform a denial-of-service attack against the statistical reporting features by systematically deleting all stored entries, thereby blinding administrators to user interactions over time. Furthermore, in environments where these statistics are used for regulatory compliance or legal evidence, such unauthorized deletion could lead to significant organizational liability and reputational damage. The ability to manipulate data without detection also undermines trust in the application's security posture, potentially serving as a precursor to more severe attacks if combined with other vulnerabilities like cross-site scripting or SQL injection within related fields.
To mitigate this risk, immediate action is required by upgrading the Contact Form by Supsystic plugin to version 1.11.1 or later, where these access control checks have been implemented. Administrators should also ensure that their WordPress installations are fully patched and configured with strong authentication policies. As a defensive measure in environments where patching might be delayed due to compatibility concerns, implementing Web Application Firewall rules can help block requests targeting the specific AJAX endpoint associated with statistics deletion unless they originate from trusted internal networks or contain valid security tokens. Additionally, monitoring server logs for unusual patterns of DELETE operations on database tables linked to form submissions can aid in early detection and incident response efforts related to this vulnerability class.