CVE-2025-49247: Team Showcase Plugin XSS Vulnerability

CVE-2025-49247 Overview

CVE-2025-49247 is a DOM-based Cross-Site Scripting (XSS) vulnerability in the cmoreira Team Showcase plugin for WordPress, tracked as team-showcase-cm. The flaw stems from improper neutralization of input during web page generation [CWE-79]. It affects all plugin versions up to and including 25.05.13. An unauthenticated attacker can craft a malicious link that, when clicked by a victim, executes attacker-controlled JavaScript in the victim's browser session. The scope-changed CVSS vector indicates the script can impact resources beyond the vulnerable component.

Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in a victim's browser, enabling session theft, credential harvesting, and unauthorized actions on WordPress sites running the Team Showcase plugin.

Affected Products

WordPress Team Showcase plugin (team-showcase-cm) by cmoreira
All versions from initial release through 25.05.13
WordPress sites with the vulnerable plugin installed and active

Discovery Timeline

2025-07-04 - CVE-2025-49247 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-49247

Vulnerability Analysis

The Team Showcase plugin fails to sanitize user-controlled input before incorporating it into the Document Object Model (DOM). Client-side JavaScript reads attacker-controlled data — typically from URL parameters or the URL fragment — and writes it into the page without encoding. This produces a DOM-based XSS condition exploitable without server interaction.

DOM-based XSS executes entirely in the browser. The malicious payload never needs to traverse the server, which means traditional server-side input filters and web application firewall (WAF) rules that inspect request bodies may not observe the attack. User interaction is required, as exploitation depends on a victim clicking a crafted link.

The vulnerability carries a scope-changed impact, meaning injected scripts can affect resources beyond the plugin's security context. Attackers can leverage this to interact with the broader WordPress session, including authenticated administrator sessions.

Root Cause

The root cause is missing output encoding in the plugin's client-side rendering logic. The plugin writes URL-derived values into the DOM using sinks such as innerHTML or jQuery's .html() without first applying contextual encoding or sanitization, allowing <script> tags and event handlers to execute.

Attack Vector

An attacker crafts a URL pointing to a WordPress page that loads the Team Showcase plugin, appending a malicious payload in a parameter or fragment. The attacker delivers the link through phishing, social media, or a compromised site. When the victim opens the link, the plugin's JavaScript reads the parameter and injects it into the page, executing the payload with the victim's privileges.

For verified technical details, see the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-49247

Indicators of Compromise

Web server access logs containing requests to pages using the Team Showcase plugin with suspicious query strings or URL fragments containing <script>, javascript:, onerror=, or onload= patterns
Unexpected outbound requests from user browsers to attacker-controlled domains shortly after visiting Team Showcase pages
WordPress administrator account anomalies such as new users, modified plugins, or unexpected session activity following click events on suspicious links

Detection Strategies

Inspect HTTP request logs for URL parameters containing encoded or raw HTML and JavaScript on URLs referencing the plugin's shortcodes or rendered pages
Deploy Content Security Policy (CSP) reporting endpoints to capture inline script execution attempts and external resource loads
Review browser-side telemetry and endpoint detection alerts for script-driven credential exfiltration originating from WordPress front-end pages

Monitoring Recommendations

Monitor the WordPress wp-content/plugins/team-showcase-cm/ directory for unauthorized file changes and confirm the installed version against the patched release
Alert on creation of WordPress administrator accounts or changes to user roles that occur outside scheduled maintenance windows
Track referrer headers and click sources for inbound traffic to pages containing the Team Showcase shortcode to identify phishing campaigns targeting your site

How to Mitigate CVE-2025-49247

Immediate Actions Required

Update the Team Showcase plugin to the patched release that follows version 25.05.13 immediately
If a patched version is not yet available for your environment, deactivate and remove the plugin until a fix is applied
Force password resets for WordPress administrator accounts if any indication of compromise is detected

Patch Information

The vendor has addressed the issue in a release subsequent to 25.05.13. Refer to the Patchstack advisory for CVE-2025-49247 for the fixed version and upgrade guidance. Apply the update through the WordPress plugin manager or by replacing the plugin directory with the latest release.

Workarounds

Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Configure a WAF rule to strip or block requests containing script tags, event handlers, or javascript: URIs in query parameters targeting pages rendered by the plugin
Restrict access to pages using the Team Showcase shortcode to authenticated users where business requirements allow, reducing the unauthenticated attack surface

bash

# Example WordPress CLI commands to identify and update the vulnerable plugin
wp plugin list --name=team-showcase-cm --fields=name,status,version
wp plugin update team-showcase-cm
wp plugin deactivate team-showcase-cm   # if no patched version is available