CVE-2025-54016 Overview
CVE-2025-54016 is a DOM-based cross-site scripting (XSS) vulnerability in the Kyle Gilman Videopack WordPress plugin, also known as video-embed-thumbnail-generator. The flaw affects all versions up to and including 4.10.3. The plugin fails to properly neutralize user-controlled input during web page generation, allowing attackers to inject arbitrary JavaScript that executes in a victim's browser. Exploitation requires low-privileged authentication and user interaction, and the impact crosses security scopes, potentially affecting confidentiality, integrity, and availability of the WordPress site. The vulnerability is categorized under CWE-79.
Critical Impact
Authenticated attackers can execute arbitrary JavaScript in victim browsers, enabling session hijacking, credential theft, and unauthorized actions on affected WordPress sites.
Affected Products
- Kyle Gilman Videopack (video-embed-thumbnail-generator) WordPress plugin
- All versions from n/a through 4.10.3
- WordPress installations with the vulnerable plugin activated
Discovery Timeline
- 2025-07-16 - CVE-2025-54016 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-54016
Vulnerability Analysis
The vulnerability arises from improper neutralization of input during web page generation within the Videopack plugin. The plugin processes user-supplied data on the client side and writes it into the Document Object Model (DOM) without adequate sanitization or encoding. When a victim visits a crafted page or interacts with malicious content served through the plugin, the injected script executes in the browser context of that visitor.
The scope-changed nature of the flaw indicates that exploitation affects resources beyond the vulnerable component itself. In a WordPress context, this typically means attacker-controlled JavaScript can access cookies, session tokens, and administrative interfaces reachable by the victim. User interaction is required, meaning the attacker must trick a target into loading a crafted URL or interacting with attacker-influenced plugin content.
Root Cause
The root cause is missing or insufficient output encoding for data written to the DOM. The Videopack plugin includes client-side JavaScript that constructs page elements from parameters that an attacker can influence. Without proper sanitization using safe DOM APIs or context-aware encoding, malicious payloads embedded in those parameters are parsed and executed as script.
Attack Vector
Exploitation proceeds over the network and requires an authenticated user with low privileges to trigger or plant the payload, plus a victim who interacts with the malicious content. A typical scenario involves an attacker submitting a crafted video embed, thumbnail parameter, or URL that the plugin later renders in the DOM. When an administrator or another visitor loads the affected page, the injected script executes with the victim's session privileges.
No verified proof-of-concept code is publicly available. Refer to the Patchstack Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-54016
Indicators of Compromise
- Unexpected <script> tags, event handlers, or javascript: URIs stored in Videopack plugin options, post metadata, or video attachment fields.
- Outbound HTTP requests from administrator browsers to unfamiliar domains shortly after loading pages containing embedded videos.
- New or modified WordPress administrator accounts, plugin installations, or theme edits without corresponding audit records.
Detection Strategies
- Audit WordPress database entries created or modified by the Videopack plugin for HTML and JavaScript payloads in string fields.
- Enable WordPress activity logging to correlate low-privileged user actions with subsequent administrative changes.
- Deploy a web application firewall rule set that flags reflected and stored XSS patterns targeting known Videopack endpoints and parameters.
Monitoring Recommendations
- Monitor browser Content Security Policy (CSP) violation reports for inline script executions on pages that render Videopack content.
- Alert on WordPress wp_options, postmeta, and attachment metadata changes containing <script, onerror=, or onload= substrings.
- Track authentication events and session activity for administrator accounts following visits to pages with user-generated video embeds.
How to Mitigate CVE-2025-54016
Immediate Actions Required
- Identify all WordPress sites running Videopack video-embed-thumbnail-generator version 4.10.3 or earlier and prioritize them for remediation.
- Restrict contributor and author-level accounts from posting video embeds until the plugin is updated.
- Force session invalidation and password rotation for administrator accounts that may have loaded pages containing untrusted video content.
Patch Information
At the time of NVD publication, the advisory references versions up to and including 4.10.3 as vulnerable. Site operators should upgrade to the latest release of the Videopack plugin that addresses this issue and consult the Patchstack Vulnerability Report for the fixed version.
Workarounds
- Deactivate and remove the Videopack plugin until a patched version can be installed.
- Deploy a strict Content Security Policy that disallows inline scripts and unauthorized external script sources on WordPress pages.
- Apply web application firewall rules that filter script-like payloads submitted to plugin endpoints and parameters.
# Content Security Policy header example for WordPress hardening
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
