CVE-2025-49247: Team Showcase XSS Vulnerability

CVE-2025-49247 Overview

CVE-2025-49247 is a DOM-Based Cross-Site Scripting (XSS) vulnerability in the cmoreira Team Showcase WordPress plugin (team-showcase-cm). The flaw stems from improper neutralization of input during web page generation [CWE-79]. It affects all plugin versions from initial release through 25.05.13. An attacker can craft a malicious URL or payload that, when processed by the vulnerable client-side code, executes arbitrary JavaScript in the victim's browser. Exploitation requires user interaction, such as clicking a crafted link. Successful exploitation enables session theft, credential harvesting, redirection, and unauthorized actions performed in the context of the targeted WordPress site.

Critical Impact

Attackers can execute arbitrary JavaScript in a victim's browser session, potentially compromising authenticated WordPress users including administrators.

Affected Products

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

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 input that is later written into the Document Object Model (DOM) on the client side. This results in a DOM-Based XSS condition where attacker-controlled data flows from a source such as location.hash, location.search, or document.referrer into a dangerous sink such as innerHTML, document.write, or eval. Because the unsafe handling occurs in JavaScript executed in the browser, the payload is never necessarily seen by the server, complicating server-side detection. The vulnerability is categorized under [CWE-79] and affects the integrity and confidentiality of user sessions on any WordPress site running the plugin at version 25.05.13 or earlier.

Root Cause

The root cause is missing or insufficient output encoding in the plugin's client-side JavaScript. User-controllable values are concatenated directly into HTML strings or DOM properties without escaping characters such as <, >, ", and '. As a result, an attacker can inject <script> tags or event-handler attributes that the browser then parses and executes.

Attack Vector

The attack is network-based and requires user interaction. An attacker delivers a crafted URL referencing a page that loads the vulnerable plugin script. When the victim visits the link, the plugin's JavaScript reads the malicious payload from a URL parameter or fragment and injects it into the page. The script then executes with the victim's privileges on the affected WordPress site. The scope is changed, meaning the injected code can affect resources beyond the vulnerable component itself, such as other plugins, the admin dashboard, or authenticated cookies accessible via the document context.

No verified public proof-of-concept code is available. See the PatchStack Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-49247

Indicators of Compromise

• Unexpected <script> tags or inline event handlers appearing in rendered Team Showcase plugin output
• Outbound browser requests to attacker-controlled domains originating from pages embedding the plugin
• WordPress access logs containing requests with suspicious URL parameters or fragments referencing the plugin's pages
• Session cookies or authentication tokens appearing in third-party logs or referrers

Detection Strategies

• Inventory all WordPress installations and identify sites running team-showcase-cm at version 25.05.13 or earlier
• Inspect HTTP request logs for crafted query strings, hash fragments, or referer headers targeting plugin endpoints
• Use browser-based DOM XSS scanners against pages that render Team Showcase shortcodes or widgets
• Review client-side JavaScript for unsanitized sinks such as innerHTML, document.write, and eval consuming URL-derived input

Monitoring Recommendations

• Enable WordPress audit logging and forward events to a centralized SIEM for correlation
• Deploy Content Security Policy (CSP) reporting to capture script-source violations indicative of injection attempts
• Monitor administrative user sessions for anomalous activity following visits to plugin pages
• Alert on plugin file modifications and unexpected version downgrades

How to Mitigate CVE-2025-49247

Immediate Actions Required

• Update the team-showcase-cm plugin to a version newer than 25.05.13 once released by the vendor
• If no patched version is available, deactivate and remove the plugin from all WordPress installations
• Force a password reset for WordPress administrators who may have interacted with crafted links
• Review WordPress user roles and remove unused administrator accounts

Patch Information

At the time of publication, the advisory lists affected versions as n/a through < 25.05.13. Site operators should consult the PatchStack Vulnerability Report and the plugin's official WordPress.org page for the latest fixed release.

Workarounds

• Deploy a Web Application Firewall (WAF) rule to block requests containing <script>, javascript:, or HTML event handlers targeting plugin URLs
• Enforce a strict Content Security Policy that disallows inline scripts and limits script sources to trusted origins
• Restrict access to WordPress administrative pages by IP address where feasible
• Educate users and administrators to avoid clicking unsolicited links pointing to the WordPress site

# Example restrictive Content-Security-Policy header for WordPress (nginx)
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self';" always;