CVE-2025-13847: PhotoFade WordPress Plugin XSS Vulnerability

CVE-2025-13847 Overview

The PhotoFade plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the time parameter in all versions up to, and including, 0.2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Critical Impact

Authenticated attackers with Contributor-level privileges can persistently inject malicious scripts that execute in the browsers of all users who view the affected pages, potentially leading to session hijacking, credential theft, and website defacement.

Affected Products

• PhotoFade WordPress Plugin version 0.2.1 and earlier
• WordPress websites with PhotoFade plugin installed

Discovery Timeline

• 2026-01-07 - CVE CVE-2025-13847 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-13847

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Stored Cross-Site Scripting. The flaw exists because the PhotoFade plugin fails to properly sanitize user-supplied input in the time parameter before storing it in the database and subsequently fails to properly escape this data when rendering it on the page.

Stored XSS vulnerabilities are particularly dangerous because the malicious payload persists on the server and executes automatically for every user who views the compromised content. Unlike reflected XSS, victims do not need to click on a specially crafted link—simply viewing a page containing the injected script is sufficient for exploitation.

The vulnerability requires an authenticated user with at least Contributor-level privileges to exploit, which provides a limited barrier to entry but does not significantly reduce the risk in environments where multiple users have access to the WordPress dashboard.

Root Cause

The root cause of this vulnerability lies in the photo-fade.php file at line 96, where user input from the time parameter is processed without adequate input validation or output encoding. WordPress provides built-in sanitization functions such as esc_attr(), esc_html(), and wp_kses() that should be applied to user-controlled data before rendering. The absence of these security controls allows attackers to inject arbitrary JavaScript code that becomes part of the page's HTML structure.

Attack Vector

The attack vector is network-based, requiring low privileges and no user interaction. An authenticated attacker with Contributor-level access can craft malicious input containing JavaScript code within the time parameter when configuring or using the PhotoFade plugin functionality. This malicious script is stored in the WordPress database and executed in the context of any user's browser session when they view a page containing the injected content.

The vulnerability can be exploited to steal session cookies, redirect users to phishing sites, modify page content, or perform actions on behalf of authenticated users including administrators. This could potentially lead to complete site compromise if an administrator views the affected page.

For technical details on the vulnerable code, see the WordPress Plugin Photo Fade Code and the Wordfence Vulnerability Analysis.

Detection Methods for CVE-2025-13847

Indicators of Compromise

• Unexpected JavaScript code or HTML tags in page content created by Contributor-level users
• Suspicious values in the time parameter containing script tags or event handlers
• User reports of unexpected browser behavior or redirects when viewing pages with PhotoFade content
• Unusual database entries in PhotoFade-related tables containing encoded or obfuscated script content

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect XSS patterns in POST requests to WordPress admin endpoints
• Monitor WordPress database for entries containing suspicious HTML/JavaScript patterns in PhotoFade plugin tables
• Enable WordPress security plugins with XSS detection capabilities to scan for malicious content
• Review server logs for unusual POST activity targeting PhotoFade plugin endpoints

Monitoring Recommendations

• Configure Content Security Policy (CSP) headers to detect and report inline script execution attempts
• Enable browser-based XSS auditors where available and monitor security headers
• Implement real-time alerting for modifications to pages by Contributor-level users
• Regularly audit user accounts with Contributor-level or higher privileges

How to Mitigate CVE-2025-13847

Immediate Actions Required

• Disable or remove the PhotoFade plugin until a patched version is available
• Review all pages containing PhotoFade content for signs of malicious script injection
• Audit Contributor-level and above user accounts for unauthorized access
• Implement Content Security Policy headers to mitigate impact of any injected scripts

Patch Information

As of the last NVD update on 2026-01-08, no official patch has been confirmed for this vulnerability. Organizations should monitor the WordPress Plugin Photo Fade repository for updates and check the Wordfence threat intelligence page for the latest remediation guidance.

Workarounds

• Remove or deactivate the PhotoFade plugin until a security patch is released
• Restrict Contributor-level access to only trusted users who require it
• Implement a Web Application Firewall with XSS filtering rules
• Add Content Security Policy headers to prevent inline script execution

# Configuration example - Add CSP headers in Apache .htaccess
Header set Content-Security-Policy "script-src 'self'; object-src 'none'"

# For Nginx, add to server block
add_header Content-Security-Policy "script-src 'self'; object-src 'none'" always;