CVE-2025-23475: History Timeline XSS Vulnerability

CVE-2025-23475 Overview

CVE-2025-23475 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the History Timeline WordPress plugin developed by fireantology. This vulnerability arises from improper neutralization of user input during web page generation, allowing attackers to inject malicious scripts that execute in victims' browsers when they visit a specially crafted URL.

Critical Impact

Attackers can exploit this reflected XSS vulnerability to steal session cookies, hijack user accounts, redirect users to malicious sites, or perform actions on behalf of authenticated users including WordPress administrators.

Affected Products

• WordPress History Timeline plugin version 0.7.2 and earlier
• All WordPress installations using vulnerable versions of the history-timeline plugin

Discovery Timeline

• 2025-01-22 - CVE-2025-23475 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-23475

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The History Timeline plugin fails to properly sanitize user-supplied input before reflecting it back in the generated HTML output. When a user clicks on a malicious link containing JavaScript code as part of a URL parameter, the plugin includes this unsanitized input directly in the page response, causing the malicious script to execute within the context of the victim's browser session.

Reflected XSS attacks require user interaction—typically clicking a malicious link delivered via phishing emails, social media, or other attack vectors. Once executed, the attacker's script runs with the same privileges as the victim, potentially compromising WordPress administrator sessions.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the History Timeline plugin. User-controlled input parameters are not properly sanitized before being included in the HTML response. The plugin fails to implement proper escaping functions such as esc_html(), esc_attr(), or wp_kses() that WordPress provides specifically to prevent XSS attacks.

Attack Vector

An attacker can craft a malicious URL containing JavaScript payload within vulnerable parameters accepted by the History Timeline plugin. When an authenticated WordPress user (particularly an administrator) clicks this link, the malicious script executes in their browser context. This can lead to:

• Session cookie theft enabling account takeover
• Keylogging of credentials entered on the page
• Defacement of the WordPress site
• Redirection to phishing pages
• Creation of rogue administrator accounts

The attack does not require authentication to the target WordPress site, making it accessible to any external attacker who can successfully deliver the malicious URL to a victim.

Detection Methods for CVE-2025-23475

Indicators of Compromise

• Review web server access logs for suspicious requests to History Timeline plugin endpoints containing encoded JavaScript or HTML tags
• Monitor for URL parameters containing <script>, javascript:, onerror=, onload=, or other common XSS patterns
• Check for unexpected administrative actions that may indicate session hijacking
• Analyze browser console logs for unauthorized script execution errors

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block reflected XSS patterns in URL parameters
• Deploy content security policy (CSP) headers to limit script execution sources
• Use security plugins that monitor for XSS attack signatures in incoming requests
• Enable WordPress audit logging to track suspicious administrative activities

Monitoring Recommendations

• Configure real-time alerts for requests containing common XSS payloads targeting plugin endpoints
• Monitor authentication logs for session anomalies that may indicate cookie theft
• Track plugin file integrity to detect unauthorized modifications
• Review outbound connections from the WordPress server for data exfiltration attempts

How to Mitigate CVE-2025-23475

Immediate Actions Required

• Update the History Timeline plugin to a patched version if available from the vendor
• If no patch is available, consider temporarily deactivating the History Timeline plugin until a fix is released
• Implement Content Security Policy headers to mitigate the impact of potential XSS attacks
• Review and rotate session tokens and administrator credentials as a precaution
• Educate users about phishing attacks and the risks of clicking untrusted links

Patch Information

Security researchers at Patchstack have documented this vulnerability. Users should monitor the Patchstack Vulnerability Report for updates regarding patches and recommended actions. Check the WordPress plugin repository for updated versions of the History Timeline plugin that address this XSS vulnerability.

Workarounds

• Temporarily disable the History Timeline plugin if it is not critical to site operations
• Implement a Web Application Firewall (WAF) with XSS filtering rules to block malicious requests
• Add Content Security Policy headers to restrict inline script execution
• Use WordPress security plugins that provide real-time XSS attack prevention

# Example: Add Content Security Policy header in .htaccess
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"

# Example: Apache mod_security rule to block common XSS patterns
SecRule ARGS "@rx <script" "id:1001,phase:2,deny,status:403,msg:'XSS Attack Detected'"