Description

Unauthenticated Bypass Vulnerability in Contact Form by Supsystic < 1.10.0 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-18T15:17:05.867Z",
  "pubdate": "2026-08-18T15:17:05.867Z",
  "executiveSummary": "An unauthenticated bypass vulnerability has been identified in the Contact Form by Supsystic plugin, specifically affecting versions prior to 1.10.0. This security flaw enables remote attackers to bypass authentication controls and interact with internal plugin logic without requiring prior authorization or valid credentials. The vulnerability exposes the affected WordPress installations to unauthorized access vectors, potentially leading to unauthorized data manipulation or further exploitation depending on the underlying codebase exposure. Attackers require network access to the target WordPress site to exploit this flaw, leveraging the lack of proper authentication checks within the vulnerable component. Given that the vulnerability can be exploited by unauthenticated entities, the risk implication is significant for organizations relying on the affected versions. Remediation requires updating the Contact Form by Supsystic plugin to version 1.10.0 or later to ensure proper access controls and authentication enforcement are applied.",
  "technicalDetails": "The vulnerability resides in the Contact Form by Supsystic plugin for WordPress, impacting all versions strictly below 1.10.0. The root cause of the security defect stems from insufficient or absent authentication validation mechanisms within specific request handlers or endpoints exposed by the plugin. Specifically, the vulnerable component fails to verify whether incoming HTTP requests originate from authenticated users with appropriate privileges before executing sensitive functions or processing logic.\nFrom an attack flow perspective, an unauthenticated remote attacker can craft specialized HTTP requests targeting the vulnerable endpoints within the plugin. Because the application logic lacks proper session verification or capability checks, the server processes the incoming payload as if it originated from a legitimate, authorized user. Network exposure is broad, as these endpoints are typically accessible over standard HTTP/S protocols exposed to the internet by the WordPress environment.\nThe exploitation method relies on sending crafted requests directly to the affected plugin components without supplying any authentication tokens, cookies, or credentials. Depending on the exact codebase functionality exposed by the bypass, the payload behavior can facilitate unauthorized actions, functional access circumvention, or interaction with backend database queries and administrative routines typically restricted to privileged roles. Privilege requirements for exploitation are completely absent, allowing any anonymous network user to trigger the flaw.\nPost-exploitation impact involves the unauthorized execution of plugin-specific operations, which may serve as a stepping stone for broader system compromise, data leakage, or further integrity violations within the affected WordPress instance. The lack of robust input validation and access control enforcement compounds the severity of the flaw, making comprehensive source code updates essential for restoring security posture."
}