CVE-2026-65480 in TheGem Plugin
Summary
by MITRE • 07/23/2026
Contributor Cross Site Scripting (XSS) in TheGem <= 5.11.1 versions.
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Analysis
by VulDB Data Team • 07/23/2026
TheGem is a popular WordPress theme that has been found to contain a contributor cross site scripting vulnerability affecting versions up to and including 5.11.1. This vulnerability allows users with contributor level permissions to execute malicious scripts within the context of other users' browsers, potentially leading to unauthorized actions or data theft. The flaw exists due to insufficient input validation and output sanitization within the theme's handling of user-submitted content, particularly in areas where HTML content is processed and displayed without proper security measures.
This specific vulnerability falls under CWE-79 which represents Cross Site Scripting flaws in software applications. The issue manifests when contributors create or edit content that includes malicious script tags which are then rendered on pages accessible to other users with higher privileges. The exploitation occurs because the theme fails to properly escape or filter user inputs before displaying them in web pages, creating an environment where attacker-controlled code can execute in the browser context of unsuspecting victims.
The operational impact of this vulnerability is significant as it allows attackers with contributor accounts to escalate their privileges and potentially compromise entire WordPress installations. Attackers could inject malicious scripts that steal cookies, session tokens, or other sensitive information from administrators who view compromised pages. Additionally, the vulnerability enables persistent XSS attacks where malicious code remains stored on the server and executes each time affected pages are loaded, making it particularly dangerous for long-term exploitation.
Security professionals should implement immediate mitigations including updating to TheGem version 5.11.2 or later which contains the necessary patches for this vulnerability. Organizations should also enforce strict content validation policies and consider implementing Content Security Policy headers to limit script execution capabilities. Regular security audits of WordPress themes and plugins are essential to identify similar vulnerabilities before they can be exploited in production environments.
According to ATT&CK framework, this vulnerability maps to T1059.008 which covers scripting languages and T1547.001 for registry run keys/ startup folder. The attack chain typically begins with gaining a contributor account through social engineering or credential compromise, followed by content injection techniques that leverage the XSS flaw to establish persistent access or exfiltrate sensitive data from administrative users who interact with the compromised theme functionality.