Description

Unauthenticated Cross Site Request Forgery (CSRF) in Hash Form <= 1.4.0 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-08-24T12:16:55.813Z",
  "pubdate": "2026-08-24T12:16:55.813Z",
  "executiveSummary": "An unauthenticated Cross-Site Request Forgery (CSRF) vulnerability has been identified in the Hash Form plugin in versions less than or equal to 1.4.0. This security flaw enables remote attackers to trick authenticated users into executing unauthorized state-changing actions without their explicit consent.\nThe vulnerability exposes affected WordPress sites utilizing the vulnerable component to malicious manipulations, potentially leading to unauthorized data submission or administrative state alterations depending on the context of the application and the privileges of the target user.\nExploitation requires an unauthenticated attacker to successfully deliver a crafted exploit payload via social engineering vectors—such as malicious links or third-party web pages—to an active user session with sufficient privileges. Successful exploitation bypasses standard interaction protocols by leveraging the victim's authenticated browser state against the vulnerable application endpoints.\nThe risk implications include unauthorized execution of form-related actions, potential data integrity degradation, and secondary exploitation paths if administrative users are targeted. The vulnerability stems from a lack of adequate request verification mechanisms, such as anti-CSRF tokens, within the request handling flow of the affected versions.",
  "technicalDetails": "The vulnerability resides in the request validation logic of Hash Form versions <= 1.4.0, specifically lacking implementation of robust anti-CSRF tokens (such as nonces) to verify the authenticity of incoming state-changing HTTP requests.\nBecause authentication requirements are absent for the targeted form submission mechanisms, the application fails to validate whether the request originated from a legitimate user interaction or an unauthorized external site.\nThe attack flow proceeds when an unauthenticated attacker crafts a malicious HTML page or script containing automated form submissions or forged requests directed toward the vulnerable endpoint of a target site running Hash Form.\nWhen an authenticated user visits the attacker-controlled page while maintaining an active session with the vulnerable web application, the browser automatically includes session identifiers, such as cookies, with the forged cross-origin request.\nThe vulnerable component processes the incoming HTTP request without performing origin validation or session-intent verification, accepting the forged payload as a legitimate user action.\nThe network exposure is broad, as any internet-based attacker can host the exploit payload and target users of the affected system via standard web protocols. Privilege requirements for the attacker are non-existent (unauthenticated), although the impact relies on the privilege level of the victim interacting with the forged request.\nPost-exploitation impact includes the unauthorized execution of operations supported by the form handling functionality, leading to unintended data insertion, configuration modifications, or interaction with backend database routines associated with the Hash Form component."
}