CVE-2026-62049 in JetBlocks Plugin
Summary
by MITRE • 10/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Crocoblock JetBlocks For Elementor jet-blocks allows Stored XSS.This issue affects JetBlocks For Elementor: from n/a through 1.5.2.1.
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Analysis
by VulDB Data Team • 10/09/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability is categorized under the CWE-79 standard from the Common Weakness Enumeration directory, which details weaknesses related to the injection of client-side scripts into web pages viewed by other users. In the context of the Crocoblock JetBlocks for Elementor plugin, specifically within versions ranging from n/a through 1.5.2.1, this flaw manifests as a Stored XSS vulnerability. Unlike reflected XSS where malicious payloads are delivered via URLs or form submissions that require immediate user interaction to execute, stored vulnerabilities persist on the target server. This means that once an attacker successfully injects their malicious script into the application's data store, such as a database or file system, it is automatically served to every subsequent visitor who views the affected content without any further action required from the victim.
The technical root cause lies in the insufficient validation and sanitization of user-supplied input before it is rendered within HTML contexts by the JetBlocks plugin. When users create or edit content using Elementor widgets provided by this extension, the application fails to properly escape special characters that have semantic meaning in HTML, such as angle brackets, quotation marks, and ampersands. Consequently, an attacker can craft a malicious payload containing JavaScript code disguised within legitimate-looking text fields, image alt tags, or other input parameters accepted by the plugin's interface. Because Elementor is a popular page builder used extensively for designing WordPress websites, this vulnerability affects sites that rely on dynamic content generation through these specific blocks. The lack of output encoding allows the browser to interpret the injected string not as plain data but as executable code within the context of the victim’s session.
The operational impact of this Stored XSS vulnerability is severe and multifaceted, primarily centering around the compromise of user sessions and sensitive data integrity. Since the malicious script executes in the context of the vulnerable website, it inherits the same privileges as legitimate scripts loaded by that site. This allows an attacker to perform actions such session hijacking, where they steal authentication cookies or tokens stored in browser storage, thereby gaining unauthorized access to administrator accounts or other user profiles on the affected WordPress installation. Furthermore, attackers can manipulate page content dynamically, defacing websites or redirecting users to phishing sites designed to harvest credentials. In more advanced attack scenarios, the script can act as a keylogger within the browser session, capturing keystrokes entered by site administrators, including passwords and sensitive configuration details. This undermines the trustworthiness of the website for its visitors and poses significant risks to data privacy and compliance with standards such as GDPR or HIPAA if personal information is exposed.
From an offensive security perspective, this vulnerability aligns with several tactics in the MITRE ATT&CK framework. It falls under the Initial Access technique of Valid Accounts when combined with social engineering to trick users into viewing malicious content, but more critically it maps to Execution techniques involving Browser Scripting and Command Line Interface execution via browser APIs. The persistence aspect is covered by Persistence mechanisms that utilize local storage or cookies to maintain access even after session expiration. Defenders must recognize that stored XSS often requires a lower level of initial interaction from the victim compared to reflected variants, making it particularly dangerous in community-driven platforms or blogs where user-generated content is prevalent.
Mitigation strategies for this vulnerability focus on both immediate remediation and long-term defensive architecture changes. The most effective solution is to upgrade the Crocoblock JetBlocks plugin to a version newer than 1.5.2.1, as developers typically release patches that implement proper input validation and output encoding mechanisms once such flaws are reported. For organizations unable to update immediately due to compatibility constraints with other plugins or custom code, implementing Web Application Firewall rules can provide temporary protection by detecting and blocking common XSS payloads in HTTP requests before they reach the application logic. Additionally, administrators should enforce strict Content Security Policy headers that restrict the sources from which scripts can be loaded, thereby neutralizing many inline script injection attempts even if validation fails. Regular security audits of third-party plugins are essential to ensure that input handling follows secure coding standards such as OWASP Top Ten guidelines, specifically focusing on preventing injection flaws through rigorous sanitization and encoding practices at every layer of the application stack.