CVE-2026-94680 in The Post Grid Plugin
Summary
by MITRE • 09/23/2026
Contributor Cross Site Scripting (XSS) in The Post Grid <= 7.9.5 versions.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified as Contributor Cross-Site Scripting within the Post Grid plugin for WordPress, affecting versions up to and including 7.9.5, represents a significant security flaw rooted in insufficient input validation and output encoding mechanisms. This specific weakness allows attackers with contributor-level or lower privileges on a WordPress installation to inject malicious client-side scripts into web pages viewed by other users. The core technical issue lies in the application's failure to properly sanitize user-supplied data before it is rendered in the browser context, specifically within features that allow contributors to manage grid layouts or content displays. By exploiting this flaw, an attacker can execute arbitrary JavaScript code in the context of the victim's session, bypassing standard security controls such as Same-Origin Policy because the script runs with the same privileges as legitimate application scripts.
From a technical perspective, this vulnerability is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting. The attack vector typically involves the attacker crafting a malicious payload containing JavaScript code and injecting it into fields or parameters controlled by the Post Grid plugin that are subsequently displayed on public-facing pages without adequate encoding. Since WordPress contributors have permission to create and edit posts, they can leverage these capabilities within the grid configuration interface to embed their scripts. When an administrator or another user with higher privileges views the affected page, the browser interprets the injected script as legitimate code from the trusted domain, leading to potential session hijacking, defacement, or redirection to malicious sites.
The operational impact of this vulnerability extends beyond simple visual manipulation. An attacker can steal sensitive information such as administrative cookies, authentication tokens, and CSRF (Cross-Site Request Forgery) tokens stored in the browser's local storage or cookies. This capability effectively allows a low-privileged user to escalate their privileges by impersonating an administrator through session hijacking. Furthermore, the vulnerability can be used to perform actions on behalf of the victim without their knowledge, such as modifying site settings, creating new administrative users, or deleting content. The presence of this flaw undermines the integrity and confidentiality of the entire WordPress installation, particularly in environments where multiple contributors are trusted with content creation but not full administrative access.
In terms of industry frameworks, this vulnerability aligns with MITRE ATT&CK technique T1059, specifically sub-technique 007 for JavaScript execution. It also relates to privilege escalation scenarios where a lower-level actor gains unauthorized control over higher-level functions through social engineering or automated exploitation of the XSS flaw. The lack of proper output encoding is a fundamental design error that violates secure coding principles mandated by standards such as OWASP Top Ten, specifically A3:2017-Injection and A5:2017-Broken Access Control if combined with privilege escalation vectors.
To mitigate this vulnerability, immediate action is required to update the Post Grid plugin to version 8.0 or later, where these input validation issues have been addressed by developers through rigorous sanitization of all user inputs and strict output encoding using functions like esc_html or wp_kses_post depending on the context. Administrators should also enforce principle of least privilege by reviewing contributor permissions and ensuring that only trusted individuals are assigned such roles. Implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious script injections before they reach the application logic, although this is not a substitute for patching the underlying code flaw. Regular security audits and penetration testing focused on input validation across all user-facing forms within WordPress plugins are essential to prevent similar vulnerabilities from being introduced in future updates or other third-party extensions.