CVE-2026-57421 in Forms Plugin
Summary
by MITRE • 07/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in CRM Perks CRM Perks Forms crm-perks-forms allows Reflected XSS.This issue affects CRM Perks Forms: from n/a through <= 1.1.7.
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Analysis
by VulDB Data Team • 07/13/2026
This cross-site scripting vulnerability represents a critical weakness in the web application's input handling mechanisms that enables attackers to inject malicious scripts into web pages viewed by other users. The flaw exists within the CRM Perks Forms plugin where user-supplied input is not properly sanitized or escaped before being rendered back to the browser, creating an environment where reflected cross-site scripting attacks can occur. The vulnerability specifically affects versions up to and including 1.1.7 of the crm-perks-forms plugin, indicating that this issue has been present in the codebase for an extended period without proper remediation.
The technical implementation of this flaw allows an attacker to craft malicious payloads that are reflected back to users through the web application's response, bypassing normal security measures designed to prevent script execution. When a user visits a specially crafted URL containing malicious input, the plugin fails to neutralize the dangerous characters in the user-supplied data before incorporating it into dynamically generated HTML content. This failure creates an opportunity for attackers to execute arbitrary scripts within the context of the victim's browser session, potentially leading to session hijacking, credential theft, or further exploitation of the affected system.
The operational impact of this vulnerability extends beyond simple script execution as it can enable attackers to impersonate legitimate users and perform unauthorized actions within the application. Attackers could leverage this weakness to steal user sessions, modify form data, redirect users to malicious websites, or even inject persistent scripts that affect all users who interact with the vulnerable plugin. The reflected nature of the attack means that the malicious input must be provided by an attacker through a link or other means, making it particularly dangerous in social engineering scenarios where users might be tricked into clicking malicious URLs.
Organizations using this plugin should immediately implement mitigations including input validation and output encoding to prevent the injection of malicious scripts. The recommended approach involves implementing strict sanitization of all user inputs before they are processed or displayed, utilizing proper HTML escaping mechanisms, and employing content security policies to limit script execution capabilities. Security practitioners should also consider implementing web application firewalls to detect and block known attack patterns targeting this specific vulnerability. This issue aligns with CWE-79 which specifically addresses improper neutralization of input during web page generation, and represents a clear violation of the principle of least privilege in web application security.
The exploitation of this vulnerability demonstrates the critical importance of proper input validation and output encoding practices in web development. Security controls should be implemented at multiple layers including application-level sanitization, server-side validation, and client-side protection mechanisms to ensure comprehensive defense against cross-site scripting attacks. Regular security audits and code reviews focusing on input handling routines can help identify similar vulnerabilities before they can be exploited by malicious actors. Organizations should also maintain up-to-date vulnerability management processes that include monitoring for new security advisories related to third-party plugins and promptly applying security patches when available.
This vulnerability represents a fundamental flaw in the plugin's architecture that violates core security principles established by industry standards such as OWASP Top Ten and NIST cybersecurity frameworks. The attack surface created by this issue allows for various exploitation techniques including phishing attacks, session hijacking, and data exfiltration. Security teams should prioritize patching this vulnerability immediately while also conducting thorough assessments of other plugins and applications to identify similar input handling weaknesses that could be exploited through the same class of vulnerabilities. The remediation process should include comprehensive testing to ensure that all user inputs are properly sanitized and that output encoding mechanisms function correctly across all affected functionality within the plugin ecosystem.
The attack pattern associated with this vulnerability follows established techniques documented in MITRE ATT&CK framework under the T1059.002 sub-technique for command and scripting interpreter, specifically targeting web application interfaces through reflected script injection. The security implications extend to potential privilege escalation scenarios where attackers might leverage this initial foothold to access additional system resources or escalate their privileges within the affected environment. Organizations should implement continuous monitoring solutions that can detect anomalous traffic patterns consistent with XSS attack payloads, while also maintaining robust backup and recovery mechanisms to address potential compromise scenarios resulting from successful exploitation of this vulnerability.