Authorization Bypass in Fluent Forms E-Signature Plugin

Authorization Bypass Through User-Controlled Key vulnerability in WP E-Signature Electronic Signature Add-on for Fluent Forms signature-fluent-contract-forms-add-on allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Electronic Signature Add-on for Fluent Forms: from n/a through 2.0.5.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The WP E-Signature Electronic Signature Add-on for Fluent Forms (versions through 2.0.5) contains an authorization bypass vulnerability (CWE-639) that allows attackers to exploit improperly configured access control mechanisms. This vulnerability is critical because electronic signature workflows often handle sensitive documents, contracts, and legally binding agreements. Organizations using this WordPress plugin for document signing—including legal firms, financial institutions, and enterprises managing contract workflows—face immediate risk of unauthorized document access, modification, or signature forgery. An attacker could bypass intended permission checks to sign documents without proper authorization or access confidential agreements they shouldn't be able to view.

Casky's 283 matching security skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability across two key MITRE ATT&CK phases: Privilege Escalation (TA0004) and Credential Access (TA0006). Practitioners using Casky would observe findings related to improper access control validation, user-controlled security parameters being passed without server-side verification, and permission checks that fail to properly authenticate the requesting user's rights to specific signatures or documents. The platform's skill mapping would highlight suspicious API calls to signature endpoints lacking proper authorization headers, requests manipulating user IDs or document tokens to access unauthorized resources, and patterns where signature permissions are enforced only client-side rather than validated server-side—all hallmarks of exploitable authorization logic.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-110383.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-110383

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