CVE-2026-1401 in Tune Library Plugin
Summary
by MITRE • 02/06/2026
The Tune Library plugin for WordPress is vulnerable to Stored Cross-Site Scripting via CSV import in all versions up to, and including, 1.6.3. This is due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the injected page. The vulnerability exists because the CSV import functionality lacks authorization checks and doesn't sanitize imported data, which is later rendered without escaping through the [tune-library] shortcode.
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Analysis
by VulDB Data Team • 02/06/2026
The vulnerability identified as CVE-2026-1401 affects the Tune Library plugin for WordPress, a widely used media library management tool that allows users to organize and display audio and video content. This particular flaw represents a critical security weakness that undermines the integrity of WordPress installations using the affected plugin version 1.6.3 or earlier. The vulnerability stems from inadequate input validation and output escaping mechanisms within the plugin's CSV import functionality, creating a persistent cross-site scripting attack vector that can be exploited by malicious actors with relatively low privileges.
The technical implementation of this vulnerability occurs through the CSV import feature which fails to properly sanitize user-supplied data before processing. When administrators or users with subscriber-level access and above import CSV files containing malicious script payloads, the plugin stores this data without adequate sanitization measures. The imported content is subsequently rendered through the [tune-library] shortcode without proper output escaping, creating a stored XSS condition where malicious scripts persist in the database and execute whenever affected pages are loaded. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and represents a classic case of insufficient output escaping in web applications.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to manipulate the WordPress environment in potentially severe ways. An authenticated attacker with subscriber privileges can inject malicious scripts that could redirect users to phishing sites, steal session cookies, or perform actions on behalf of logged-in users. The persistent nature of stored XSS means that the injected scripts will execute for any user who accesses pages containing the compromised content, potentially affecting multiple users over extended periods. This vulnerability particularly threatens WordPress sites where the plugin is used for media library management, as the injected scripts could compromise user data, manipulate content presentation, or serve as a foothold for further attacks. The attack surface is expanded due to the plugin's widespread adoption and the relatively low privilege requirements needed to exploit this flaw.
Mitigation strategies for CVE-2026-1401 must address both immediate remediation and long-term security improvements. The primary recommendation involves upgrading to the latest version of the Tune Library plugin where the vulnerability has been patched, as this resolves the core sanitization and escaping issues. Organizations should also implement strict access controls limiting who can perform CSV imports, as this reduces the attack surface by preventing unauthorized users from injecting malicious content. Additionally, administrators should consider implementing content security policies that restrict script execution within the WordPress environment, and regularly audit imported content for malicious payloads. The vulnerability demonstrates the importance of proper input validation and output escaping practices, which aligns with ATT&CK technique T1566.002 for credential access through social engineering and T1059.001 for command and scripting interpreter execution. Security monitoring should include detection of unusual CSV import activities and script injection attempts, while regular security audits of WordPress plugins should be conducted to identify similar vulnerabilities in other third-party components.