CVE-2026-83541 in Sina Extension Plugin
Summary
by MITRE • 09/09/2026
The Sina Extension for Elementor WordPress plugin before 3.10.4 does not properly escape a Table widget setting before outputting it within an HTML attribute, which could allow users with the Contributor role and above to perform Stored Cross-Site Scripting attacks.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified in the Sina Extension for Elementor WordPress plugin prior to version 3.10.4 represents a significant security flaw rooted in improper input validation and output encoding mechanisms. Specifically, the defect lies within the handling of settings associated with the Table widget component. When user-supplied data is processed by this widget, the application fails to adequately sanitize or escape special characters before embedding them into HTML attributes during page rendering. This oversight creates a direct pathway for malicious actors to inject executable script code into the web application's output stream. The flaw is particularly concerning because it does not require administrative privileges to exploit, thereby expanding the potential attack surface beyond high-privilege users to include lower-level contributors and editors within the WordPress ecosystem.
From a technical perspective, this vulnerability classifies as a Stored Cross-Site Scripting (XSS) issue, which corresponds to CWE-79 in the Common Weakness Enumeration taxonomy. Unlike reflected XSS attacks where malicious payloads are delivered via URLs or form submissions that require immediate user interaction with a crafted link, stored vulnerabilities persist within the application's data store. In this case, an attacker can inject script code through the Table widget settings interface. Once saved, this payload becomes part of the page content served to all subsequent visitors who view the affected page. When a victim loads the compromised page, their browser parses the malicious HTML attribute and executes the embedded JavaScript in the context of the vulnerable site. This execution environment allows the attacker's scripts to access cookies, session tokens, local storage, and other sensitive data associated with the user's active session on that domain.
The operational impact of this vulnerability is substantial due to its persistence and broad reach. Because the payload is stored server-side or in the database, every user who accesses the affected page becomes a potential victim without needing any specific interaction from the attacker beyond the initial injection. This characteristic makes it highly effective for phishing campaigns, session hijacking, defacement of website content, or even redirecting users to malicious third-party sites designed to distribute malware. Furthermore, if an administrator views the compromised page while logged in, their administrative credentials could be stolen, potentially leading to full compromise of the WordPress installation and associated backend systems. The ability for contributors and above to trigger this flaw means that any user with basic editing rights can perpetuate the attack against a wide audience, significantly amplifying the risk profile of the application.
Mitigation strategies must focus on both immediate remediation and long-term defensive coding practices. The primary and most effective solution is to upgrade the Sina Extension for Elementor plugin to version 3.10.4 or later, where this specific input validation flaw has been addressed by developers through proper escaping functions such as esc_attr in WordPress development standards. For organizations unable to patch immediately due to compatibility constraints, implementing a Web Application Firewall (WAF) with rules tuned to detect and block common XSS payloads within form submissions related to table widgets can provide temporary protection. Additionally, enforcing strict Content Security Policy headers that restrict the execution of inline scripts can mitigate the impact by preventing the browser from executing injected code even if it is successfully stored in the DOM. Developers should also adopt a principle of least privilege for plugin capabilities and regularly audit custom widget implementations to ensure all user inputs are rigorously validated against expected formats before being rendered into HTML contexts.