CVE-2025-31869 in Black Widgets for Elementor Plugin
Summary
by MITRE • 04/01/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Modernaweb Studio Black Widgets For Elementor allows Stored XSS. This issue affects Black Widgets For Elementor: from n/a through 1.3.9.
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Analysis
by VulDB Data Team • 04/01/2025
The vulnerability identified as CVE-2025-31869 represents a critical cross-site scripting flaw within the Black Widgets For Elementor plugin developed by Modernaweb Studio. This stored XSS vulnerability occurs during the web page generation process when user input is improperly neutralized, creating an avenue for malicious actors to inject persistent malicious scripts into the plugin's output. The vulnerability affects all versions of the plugin from the initial release through version 1.3.9, indicating a prolonged exposure window that could have allowed extensive exploitation. The issue manifests specifically within the context of web page generation where user-provided data is rendered without adequate sanitization, enabling attackers to store malicious payloads that execute in the context of other users' browsers.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the plugin's codebase. When administrators or users create content using the Black Widgets For Elementor functionality, the system fails to properly sanitize user-supplied parameters before incorporating them into dynamically generated web pages. This failure creates a persistent XSS vector where malicious scripts can be stored within the plugin's data structures and subsequently executed whenever affected pages are loaded by other users. The vulnerability operates under CWE-79 which specifically addresses improper neutralization of input during web page generation, making it a classic stored XSS implementation that allows attackers to execute malicious code in victims' browsers with the privileges of those users.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling sophisticated attack chains that can compromise entire user sessions and access sensitive data. Attackers could leverage this stored XSS to steal authentication cookies, perform unauthorized actions on behalf of logged-in users, redirect victims to malicious domains, or even deploy additional malware. The persistent nature of stored XSS means that once the malicious payload is injected, it continues to affect users until the vulnerability is patched and the malicious content is removed from the affected system. This makes the vulnerability particularly dangerous in environments where multiple users interact with the plugin, as it can affect numerous individuals over extended periods.
Organizations utilizing the Black Widgets For Elementor plugin are strongly advised to implement immediate mitigations including updating to the latest available version that addresses this vulnerability, implementing web application firewalls to detect and block suspicious script injections, and conducting thorough security assessments of all user-generated content within affected systems. The ATT&CK framework categorizes this vulnerability under T1566.001 - Phishing with Social Engineering, as attackers can leverage stored XSS to create convincing phishing campaigns that exploit user trust in legitimate websites. Additionally, organizations should consider implementing Content Security Policy headers to limit script execution and establish monitoring procedures to detect unusual script patterns in web traffic. The vulnerability highlights the critical importance of input sanitization and output encoding practices, particularly in content management systems and plugin architectures where user input directly influences web page generation processes.