CVE-2026-105884 in Rocket Lazy Load Plugin
Summary
by MITRE • 10/07/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Media Rocket Lazy Load rocket-lazy-load allows Stored XSS.This issue affects Rocket Lazy Load: from n/a through 2.4.0.
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Analysis
by VulDB Data Team • 10/07/2026
The identified security flaw represents a critical instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting or XSS, specifically within the WP Media Rocket Lazy Load plugin for WordPress environments. This vulnerability is classified under CWE-79 in the Common Weakness Enumeration framework and maps to the T1059 technique within the MITRE ATT&CK matrix, which covers execution of scripts via browser-based inputs. The core issue stems from a failure by the application to properly sanitize or validate user-supplied data before it is rendered back into the web page's HTML structure. In this specific context, the flaw allows for Stored XSS, meaning that malicious script payloads are not merely executed in an ephemeral session but are persistently saved on the target server, typically within a database field associated with posts, comments, or plugin settings.
The operational impact of this vulnerability is severe because it transforms a transient attack vector into a persistent threat. When an attacker successfully injects JavaScript code through a vulnerable input field managed by Rocket Lazy Load version 2.4.0 and earlier, that malicious content becomes part of the page source for every subsequent visitor who views the affected content. This persistence ensures that the exploit does not require social engineering to trick a specific user into clicking a crafted link; instead, any authenticated or unauthenticated user accessing the compromised page will have their browser execute the injected scripts automatically. The attacker can leverage this capability to steal session cookies, hijack administrative sessions, deface websites, redirect users to malicious phishing sites, or deploy further malware through drive-by downloads.
The technical mechanism behind this flaw likely involves a lack of output encoding when rendering user-generated content that interacts with the lazy loading functionality. Since Rocket Lazy Load is designed to optimize image and video delivery by delaying their load until they enter the viewport, it may process attributes such as alt text, titles, or custom metadata fields without applying strict whitelisting or HTML entity encoding. If these fields accept raw script tags or event handlers like onload or onerror, the browser interprets them as executable code rather than plain text data. This failure to distinguish between data and code violates fundamental web security principles regarding input validation and output encoding.
Mitigation strategies must focus on immediate remediation of the software version and rigorous input handling practices. The primary recommendation is to update the Rocket Lazy Load plugin to a patched version released after 2.4.0, where developers have presumably implemented proper sanitization routines such as wp_kses_post or similar WordPress-specific escaping functions that strip out dangerous HTML tags and attributes. For organizations unable to patch immediately due to compatibility constraints, implementing Web Application Firewall rules can provide temporary protection by blocking requests containing known XSS payloads in the relevant input parameters. Additionally, enforcing Content Security Policy headers with strict script-src directives can significantly reduce the impact of any successful injection attempts by preventing unauthorized scripts from executing within the browser context. Regular security audits and code reviews focusing on data flow to output points are essential for maintaining long-term resilience against such vulnerabilities.