CVE-2026-121722 in Formidable Forms Signature Online Contract Automation Plugin
Summary
by MITRE • 11/09/2026
Missing Authorization vulnerability in WP E-Signature Formidable Forms Signature Online Contract Automation forms-signature-formidable-online-contract-automation allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Formidable Forms Signature Online Contract Automation: from n/a through 2.0.5.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 11/09/2026
The vulnerability identified in the WP E-Signature plugin for Formidable Forms, specifically within versions ranging from initial release up to version 2.0.5, represents a critical failure in access control mechanisms that governs how digital signatures and contract data are managed. This flaw is categorized under CWE-862, which denotes Missing Authorization, indicating that the application fails to properly verify whether an authenticated user has the necessary permissions to perform specific actions on resources they do not own or have no business accessing. In the context of online contract automation, such a lapse allows attackers to bypass intended security boundaries and manipulate sensitive documents without proper authorization checks.
From a technical perspective, this incorrect configuration of access control levels implies that the plugin does not adequately validate user roles or session states when processing requests related to signature creation, modification, or retrieval. An attacker can exploit this by crafting malicious HTTP requests that target internal API endpoints or form submission handlers associated with other users' contracts. Because the server-side logic relies on insufficient checks before executing these operations, it is possible for a lower-privileged user, such as a standard subscriber or even an unauthenticated visitor depending on the specific implementation details, to escalate their privileges and alter contract terms, forge signatures, or delete existing agreements belonging to other users.
The operational impact of this vulnerability extends beyond simple data leakage; it strikes at the core integrity of digital contracts which are legally binding documents. If an attacker successfully exploits this missing authorization flaw, they could modify critical clauses in a contract before it is signed by all parties, potentially leading to significant financial loss or legal disputes for victims. Furthermore, the ability to forge signatures undermines trust in the entire e-signature ecosystem provided by the plugin. This aligns with MITRE ATT&CK technique T1078, Valid Accounts, as exploitation often requires initial access through valid credentials, and T1534, Internal Spearphishing, if used for lateral movement within an organization to target specific high-value contracts.
Mitigation strategies must focus on immediate remediation of the codebase alongside broader security hardening practices. The primary recommendation is to upgrade the WP E-Signature plugin to a version later than 2.0.5 where these access control checks have been properly implemented and tested by the developers. Until an update is available, administrators should consider disabling the plugin if it is not actively used for critical business processes. Additionally, implementing strict server-side validation that verifies user ownership of every resource being accessed or modified can serve as a compensating control. Regular security audits focusing on authorization logic in form handling and document management modules are essential to prevent similar vulnerabilities from persisting in future updates.