CVE-2026-96895 in WP YouTube Lyte Plugin
Summary
by MITRE • 09/27/2026
The WP YouTube Lyte WordPress plugin before 1.7.31 does not escape some attributes of YouTube embed blocks before outputting them in an HTML attribute when rendering the block, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks.
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Analysis
by VulDB Data Team • 09/27/2026
The vulnerability identified in WP YouTube Lyte versions prior to 1.7.31 represents a significant security flaw within the WordPress plugin ecosystem, specifically targeting the handling of embedded media content. This issue stems from an insufficient input validation and output encoding mechanism when processing attributes associated with YouTube embed blocks. The core technical failure lies in the application's inability to properly sanitize user-supplied data before it is rendered into HTML attribute contexts. When a user creates or edits a post containing a YouTube embed block, specific attributes within that block are passed directly to the browser without adequate escaping. This lack of sanitization allows malicious actors who possess even low-level privileges, such as contributors, to inject executable JavaScript code into the page structure. The vulnerability is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting or XSS. More specifically, because the injected script is stored within the database and executed whenever a victim views the affected content, it falls squarely under Stored Cross-Site Scripting rather than reflected variants.
From an operational perspective, this vulnerability poses severe risks to both website administrators and their end-users. An attacker with contributor-level access can embed malicious scripts that execute in the context of other users' browsers when they view posts containing the compromised embed blocks. This execution environment grants the attacker significant capabilities, including but not limited to session hijacking, credential theft, defacement of the user interface, or redirection to phishing sites. The impact is particularly concerning because contributor-level access is often granted to multiple individuals for content creation purposes, thereby increasing the attack surface significantly compared to vulnerabilities requiring administrator privileges. Furthermore, since WordPress plugins are widely deployed across numerous websites, this flaw affects a broad segment of the web infrastructure that relies on embedded video content for engagement and information dissemination. The persistence of stored XSS means that remediation requires not only patching the software but also cleaning any previously injected malicious payloads from the database to prevent ongoing attacks against unsuspecting visitors.
The exploitation vector aligns with several techniques documented in the MITRE ATT&CK framework, particularly those related to client-side code injection and session manipulation. Attackers can leverage this vulnerability as part of a broader campaign where initial access is gained through compromised contributor accounts or social engineering tactics that trick users into submitting malicious embed configurations. Once executed, the injected scripts can interact with Document Object Model elements to steal cookies containing authentication tokens, effectively bypassing security controls like HTTP-only flags if not properly configured across all domains involved in session management. Additionally, these scripts could monitor user interactions and exfiltrate sensitive data entered on subsequent pages visited by the victim while authenticated against the compromised site. The persistence of this threat necessitates immediate attention from development teams responsible for maintaining the plugin's codebase to ensure that future releases implement robust sanitization protocols.
Mitigation strategies must focus on both technical remediation and procedural security enhancements. The primary solution is to upgrade WP YouTube Lyte to version 1.7.31 or later, where developers have addressed the attribute escaping issue by implementing strict output encoding functions such as esc_attr in WordPress development standards. This ensures that any special characters within user inputs are converted into their corresponding HTML entities before being rendered, thereby neutralizing potential script execution vectors. In addition to upgrading, administrators should enforce principle of least privilege by reviewing contributor accounts and removing unnecessary access rights from users who do not require them for daily operations. Implementing a Web Application Firewall can provide an additional layer of defense by filtering out known malicious payloads in HTTP requests before they reach the application logic. Regular security audits and code reviews focusing on input validation and output encoding practices are essential to prevent similar vulnerabilities in other plugins or custom themes that handle user-generated content. Organizations should also consider deploying Content Security Policy headers to restrict inline script execution, which can mitigate the impact of any successfully injected scripts by preventing them from running unless explicitly allowed through trusted sources.