CVE-2025-58671: Auction Feed Stored XSS Vulnerability

CVE-2025-58671 Overview

CVE-2025-58671 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Auction Feed WordPress plugin (auction-feed) developed by morganrichards. This vulnerability allows attackers to inject malicious scripts that are permanently stored on the target server and executed when users view affected pages. The improper neutralization of user-supplied input during web page generation enables attackers to compromise user sessions, steal sensitive data, or perform unauthorized actions on behalf of authenticated users.

Critical Impact

Stored XSS vulnerabilities pose significant risks as malicious payloads persist on the server and execute automatically for every user who views the compromised content, potentially affecting all site visitors and administrators.

Affected Products

• Auction Feed WordPress Plugin version 1.1.4 and earlier
• Auction Feed WordPress Plugin version 1.1.3 and earlier
• All versions of auction-feed from initial release through <= 1.1.4

Discovery Timeline

• 2025-09-22 - CVE CVE-2025-58671 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-58671

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Auction Feed plugin fails to properly sanitize user-controlled input before incorporating it into dynamically generated web pages. This allows attackers to inject arbitrary JavaScript code that gets stored in the application's database and subsequently rendered to other users viewing the affected content.

Unlike reflected XSS attacks which require victims to click malicious links, Stored XSS attacks persist on the server. When legitimate users browse pages containing auction feed content, the malicious scripts execute automatically within their browser context, inheriting the security privileges of the vulnerable web application.

The network-accessible nature of this vulnerability means exploitation can occur remotely without requiring prior authentication to the target system. However, successful exploitation does require user interaction—specifically, a victim must view the page containing the stored malicious payload.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the Auction Feed plugin. When processing auction-related data, the plugin fails to properly escape or sanitize special HTML characters before storing user input and rendering it back to the browser. This allows script tags and JavaScript event handlers to be interpreted as executable code rather than displayed as text content.

Attack Vector

The attack vector is network-based, requiring an attacker to submit malicious input through the plugin's data handling mechanisms. The attacker crafts input containing JavaScript code, which the plugin stores without adequate sanitization. When other users (including administrators) view pages displaying this auction feed content, the malicious script executes in their browser session.

Typical attack scenarios include:

• Session hijacking through cookie theft
• Keylogging and credential harvesting
• Website defacement
• Phishing attacks by injecting fake login forms
• Privilege escalation by targeting administrator accounts
• Distribution of malware through redirects

The vulnerability requires some form of user interaction (viewing the affected page) but no authentication is required from the attacker's perspective to inject the malicious payload.

Detection Methods for CVE-2025-58671

Indicators of Compromise

• Unusual JavaScript code or <script> tags appearing in auction feed database entries
• Unexpected external resource requests originating from auction feed pages
• User reports of strange behavior, pop-ups, or redirects when viewing auction content
• Suspicious outbound connections to unknown domains from client browsers
• Modified or injected HTML elements within stored auction feed data

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in form submissions
• Enable Content Security Policy (CSP) headers to restrict script execution sources
• Deploy endpoint detection solutions capable of identifying malicious script execution patterns
• Perform regular database audits scanning for embedded script tags and JavaScript event handlers in auction feed content

Monitoring Recommendations

• Monitor web server access logs for suspicious POST requests to auction feed endpoints containing encoded script patterns
• Configure browser-based XSS detection mechanisms and track violations
• Implement real-time alerting for CSP violations indicating attempted script injection
• Review audit logs for unexpected changes to auction feed plugin settings or stored content

How to Mitigate CVE-2025-58671

Immediate Actions Required

• Update the Auction Feed plugin to the latest available version immediately
• Audit existing auction feed database entries for stored malicious scripts and remove any identified payloads
• Implement Content Security Policy headers to mitigate the impact of any successful XSS exploitation
• Consider temporarily disabling the Auction Feed plugin until a patched version is confirmed
• Review administrator account access logs for signs of compromise

Patch Information

Refer to the Patchstack Vulnerability Report for detailed information about available patches and remediation guidance. Users should check for plugin updates through the WordPress admin dashboard and apply any security updates released by morganrichards.

Workarounds

• Disable the Auction Feed plugin entirely until a security patch is available
• Implement server-side input validation to strip or encode potentially dangerous HTML characters
• Deploy a Web Application Firewall with XSS filtering rules
• Enable strict Content Security Policy headers to prevent inline script execution
• Restrict plugin functionality to trusted users only

# WordPress wp-config.php - Add CSP headers as temporary mitigation
# Add to theme's functions.php or use a security plugin
add_action('send_headers', function() {
    header("Content-Security-Policy: script-src 'self'; object-src 'none';");
    header("X-XSS-Protection: 1; mode=block");
    header("X-Content-Type-Options: nosniff");
});