CVE-2026-62039 in Html5 Audio Player Plugin
Summary
by MITRE • 10/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in bPlugins Html5 Audio Player html5-audio-player allows Stored XSS.This issue affects Html5 Audio Player: from n/a through 2.8.8.
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Analysis
by VulDB Data Team • 10/09/2026
The identified vulnerability represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this flaw is classified under the CWE-79 standard and manifests within the bPlugins Html5 Audio Player plugin for WordPress environments. The security issue allows for Stored XSS attacks, which distinguishes it from reflected variants by persisting malicious payloads on the target server rather than merely reflecting them in a single HTTP response. This persistence mechanism significantly escalates the severity of the vulnerability because the injected script is served to every user who views the affected content, thereby increasing the attack surface and potential impact scope considerably.
The technical root cause lies in insufficient input validation or output encoding within the plugin's handling of audio metadata or configuration fields. When an attacker with sufficient privileges, such as a subscriber or higher depending on the specific implementation details, submits data containing executable JavaScript code, the application fails to sanitize this input before storing it in the database and subsequently rendering it back into HTML without proper escaping. This failure allows arbitrary script execution within the context of the victim's browser session. The vulnerability affects versions ranging from no known lower bound through version 2.8.8, indicating that all releases up to and including 2.8.8 are susceptible unless patched by a subsequent update not listed in this specific advisory range.
From an operational perspective, successful exploitation enables attackers to execute arbitrary JavaScript code on behalf of legitimate users interacting with the compromised audio player interface. This can lead to session hijacking through theft of cookies or authentication tokens, defacement of the website content, redirection of users to malicious phishing sites, or keylogging activities that capture sensitive user input. In enterprise environments where this plugin might be used for media hosting or educational purposes, such an exploit could compromise internal networks if combined with other vulnerabilities like server-side request forgery via browser-based attacks. The persistent nature means a single successful injection can impact hundreds or thousands of visitors over time without further effort from the attacker.
The attack vector aligns closely with MITRE ATT&CK techniques related to Client-Side Scripting Injection, specifically T1059 which covers command and script interpretation through client-side mechanisms like JavaScript. By leveraging stored XSS, attackers effectively bypass many traditional network-level security controls that focus on inbound traffic filtering because the malicious payload is already inside the trusted domain of the web application after initial injection. This makes detection more challenging as the request appears legitimate when served to victims, relying instead on browser-based execution contexts rather than external intrusion attempts.
Mitigation strategies must prioritize immediate remediation through software updates. Administrators should upgrade the Html5 Audio Player plugin to a version released after 2.8.8 where this vulnerability has been addressed by developers implementing robust input sanitization and output encoding practices consistent with OWASP guidelines. Until an update is available, temporary mitigations include restricting user roles that can submit content containing audio metadata or custom configurations if possible within the WordPress ecosystem. Additionally, deploying a Web Application Firewall capable of detecting XSS patterns in POST requests may provide partial protection by blocking malicious payloads before they reach the application logic. Regular security audits and code reviews focusing on data flow from input sources to HTML output sinks are essential for preventing similar flaws in future development cycles.