CVE-2026-120843 in Posts Table with Search & Sort Plugin
Summary
by MITRE • 11/03/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Barn2 Plugins Posts Table with Search & Sort posts-data-table allows Stored XSS.This issue affects Posts Table with Search & Sort: from n/a through 1.4.14.
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Analysis
by VulDB Data Team • 11/03/2026
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 manifests as Stored XSS within the Barn2 Plugins Posts Table with Search & Sort component for WordPress. The affected software versions range from initial releases up through version 1.4.14. In a stored XSS scenario, malicious script payloads are not merely executed in the context of a single user session via a crafted link but are instead permanently saved on the target server, typically within a database or content management system storage. Consequently, every time an administrator or authorized user views the compromised page containing the injected data, the malicious code is automatically rendered and executed by their web browser. This persistence distinguishes stored XSS from reflected variants, significantly amplifying its potential impact as it affects all users who access the vulnerable interface rather than just the initial attacker.
The technical root cause lies in insufficient input validation and output encoding mechanisms within the plugin's handling of post data tables. When user-supplied content is processed for display in the search or sort functionalities, the application fails to properly sanitize special characters that have semantic meaning in HTML and JavaScript contexts. This allows an authenticated attacker with write access to posts or custom fields to inject executable scripts into the database entries. Because WordPress plugins often operate within a trusted administrative context where users expect rich text rendering, developers may inadvertently relax security controls for convenience. However, this relaxation creates a critical gap where untrusted data is treated as safe markup without adequate escaping. The vulnerability specifically impacts the posts-data-table feature, suggesting that the injection point likely resides in how table cells render dynamic content derived from post metadata or custom fields during search operations.
The operational impact of this stored XSS vulnerability is severe due to its persistent nature and high-privilege context. Since WordPress administrators possess elevated privileges within the platform, an attacker who successfully exploits this flaw can execute arbitrary JavaScript code with administrative rights in the victim's browser session. This capability enables a wide range of malicious activities including but not limited to stealing administrator cookies or authentication tokens, performing actions on behalf of the user such as creating new admin accounts, modifying site settings, defacing the website content, or redirecting users to phishing sites. The persistence of the payload means that even after the initial attack vector is discovered and patched for future inputs, existing malicious entries remain active until manually removed from the database. This creates a prolonged window of exposure where every page load serves as an execution trigger for the malware.
From a classification perspective, this vulnerability aligns with CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). More specifically, it falls under CWE-834 which addresses Session Fixation implications when session hijacking occurs via XSS in high-privilege contexts. In terms of the MITRE ATT&CK framework for enterprise security, this exploit maps to T1059: Command and Control using JavaScript within a browser environment, and potentially T1556 if it involves modifying credentials or authentication mechanisms like Multi-Factor Authentication tokens stored in local storage. The attack vector is primarily classified under Initial Access via Browser Security Misconfiguration when considering how the payload enters the system through legitimate administrative interfaces that fail to validate input rigorously.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. For organizations currently running affected versions, the most critical step is to upgrade immediately to a patched version of Barn2 Plugins Posts Table with Search & Sort released after 1.4.14 where these sanitization issues have been resolved by the vendor. Until an update can be applied, administrators should manually audit database entries for suspicious script tags or encoded JavaScript patterns within post titles, content bodies, and custom fields associated with the posts table feature. Implementing a Web Application Firewall that includes robust XSS detection rules can provide temporary protection by blocking requests containing known malicious payloads before they reach the application logic. Furthermore, developers must enforce strict output encoding practices ensuring that all dynamic data rendered in HTML contexts is properly escaped using context-aware methods such as HTML entity encoding for body content and JavaScript string escaping for inline scripts. Regular security audits focusing on input validation across all user-facing forms and API endpoints are essential to prevent similar vulnerabilities from being introduced in future updates or custom integrations.