CVE-2025-3098 Overview
CVE-2025-3098 is a Reflected Cross-Site Scripting (XSS) vulnerability [CWE-79] affecting the Video Url plugin (also known as Video Sidebar Widget) for WordPress. The flaw exists in all versions up to and including 1.0.0.3. The plugin fails to properly sanitize input and escape output on the id parameter, allowing attackers to inject arbitrary web scripts. Unauthenticated attackers can exploit this vulnerability by crafting a malicious link and tricking an authenticated user into clicking it. Successful exploitation executes attacker-controlled JavaScript in the victim's browser context.
Critical Impact
Attackers can hijack administrator sessions, steal authentication tokens, or perform actions on behalf of the victim by luring them to click a crafted URL targeting a vulnerable WordPress site.
Affected Products
- WordPress Video Url plugin (Video Sidebar Widget) versions up to and including 1.0.0.3
- WordPress sites with the plugin installed and active
- Administrators and authenticated users who interact with attacker-crafted links
Discovery Timeline
- 2025-04-02 - CVE-2025-3098 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-3098
Vulnerability Analysis
The Video Url plugin processes the id parameter from HTTP requests without applying sufficient input sanitization or output escaping. Referenced scripts include delete.php and video_edit.php within the plugin source tree. When the id parameter is reflected back into the rendered page, injected HTML and JavaScript execute in the browser of any user visiting the crafted URL.
Because this is a reflected XSS, the payload does not persist on the server. Instead, exploitation requires user interaction, typically through phishing or social engineering. The scope change indicates that injected script can affect resources beyond the vulnerable component, such as other frames or cookies within the site's origin.
Root Cause
The root cause is missing input validation and improper output encoding on the id request parameter. PHP files including delete.php and video_edit.php echo the parameter directly into HTML responses without applying WordPress escaping functions such as esc_attr(), esc_html(), or sanitize_text_field(). This classic [CWE-79] pattern allows arbitrary HTML and JavaScript to be reflected into the response body.
Attack Vector
An unauthenticated attacker crafts a URL containing a malicious payload in the id query parameter. The attacker delivers the URL to a target via email, chat, or a compromised third-party site. When the victim, particularly a logged-in administrator, clicks the link, the injected script executes with the victim's privileges on the WordPress site. Payloads can exfiltrate session cookies, perform CSRF-style state changes, or inject additional malicious content into administrative pages.
See the Wordfence Vulnerability Report and the affected sources delete.php and video_edit.php for technical details.
Detection Methods for CVE-2025-3098
Indicators of Compromise
- HTTP requests to plugin endpoints such as delete.php or video_edit.php containing <script>, javascript:, or HTML event handler strings in the id parameter
- Referrer headers from external domains linking to WordPress admin pages containing an id parameter with encoded payloads
- Unexpected outbound requests from administrator browsers to attacker-controlled domains following a click on an inbound link
Detection Strategies
- Inspect web server and WordPress access logs for suspicious id parameter values containing HTML tags, URL-encoded angle brackets (%3C, %3E), or JavaScript keywords
- Deploy Web Application Firewall (WAF) rules that block reflected XSS patterns targeting the Video Sidebar Widget plugin paths
- Enumerate WordPress installations to identify sites running the vulnerable plugin at version 1.0.0.3 or earlier
Monitoring Recommendations
- Alert on anomalous administrator session activity, such as new admin account creation or plugin installation following external link clicks
- Monitor Content Security Policy (CSP) violation reports for inline script execution on plugin pages
- Track referral patterns to WordPress admin URLs and correlate with suspicious query strings
How to Mitigate CVE-2025-3098
Immediate Actions Required
- Deactivate and remove the Video Url (Video Sidebar Widget) plugin from all WordPress installations until a patched version is available
- Audit administrator accounts and force password resets if suspicious activity is observed after link clicks
- Deploy WAF signatures to block XSS payloads targeting the id parameter on plugin endpoints
Patch Information
At the time of publication, no patched version above 1.0.0.3 has been referenced in the advisory data. Review the WordPress plugin page for updates, and consult the Wordfence Vulnerability Report for remediation guidance.
Workarounds
- Remove the plugin entirely if a patched version is not yet available
- Enforce a strict Content Security Policy that disallows inline scripts on the WordPress site
- Train administrators to avoid clicking untrusted links, especially while authenticated to the WordPress admin panel
- Restrict administrator access using IP allowlisting on /wp-admin to reduce exposure to reflected XSS delivery
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
