CVE-2026-57391 in Loops & Logic Plugin
Summary
by MITRE • 07/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Tangible Loops & Logic tangible-loops-and-logic allows Stored XSS.This issue affects Loops & Logic: from n/a through <= 4.2.3.
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Analysis
by VulDB Data Team • 07/13/2026
This cross-site scripting vulnerability represents a critical weakness in the tangible-loops-and-logic web application that enables stored malicious script execution within user sessions. The flaw stems from inadequate input validation and sanitization during web page generation processes, specifically affecting versions prior to 4.2.4 of the Loops & Logic software. When users interact with the application's web interface, improperly neutralized input data can be persistently stored and subsequently executed in other users' browsers, creating a persistent security threat that aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation. The vulnerability occurs during the dynamic generation of web content where user-supplied data is not adequately escaped or filtered before being rendered back to end users.
The operational impact of this stored XSS vulnerability extends beyond simple data theft or session hijacking, as it can enable attackers to execute malicious scripts within the context of affected user sessions. This allows threat actors to perform actions such as stealing cookies, redirecting users to malicious sites, defacing web pages, or even executing arbitrary code on victim machines. The persistent nature of stored XSS means that once an attacker successfully injects malicious code through vulnerable input fields, the script will execute automatically whenever other users view the affected content, making this vulnerability particularly dangerous for collaborative environments where multiple users interact with shared data. This threat model aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment and reflects how attackers can leverage web application vulnerabilities to establish initial access vectors.
Organizations using this software must implement immediate mitigations including comprehensive input validation, output encoding, and the implementation of Content Security Policies to prevent script execution. The most effective remediation involves upgrading to version 4.2.4 or later where the vulnerability has been patched, while additional defensive measures should include regular security assessments of user input fields, implementation of proper HTML escaping mechanisms, and monitoring for suspicious content patterns. Organizations should also consider deploying web application firewalls that can detect and block XSS attack patterns, as well as implementing strict access controls to limit who can submit potentially malicious data to the system. The vulnerability demonstrates the importance of following secure coding practices and adhering to OWASP Top Ten security guidelines that specifically address input validation and output encoding requirements to prevent such persistent security flaws from compromising user sessions and application integrity.