CVE-2025-27009: My Auctions Allegro CSRF Vulnerability

CVE-2025-27009 Overview

CVE-2025-27009 is a Cross-Site Request Forgery (CSRF) vulnerability in the wphocus My auctions allegro WordPress plugin (my-auctions-allegro-free-edition). The flaw affects all plugin versions up to and including 3.6.33. Successful exploitation leads to Stored Cross-Site Scripting (XSS), allowing attackers to persist malicious JavaScript in the WordPress site through forged administrative requests.

The weakness is classified under CWE-352: Cross-Site Request Forgery. Exploitation requires user interaction, typically tricking an authenticated administrator into visiting an attacker-controlled page. Once triggered, the injected script executes in the context of any visitor who loads the compromised page.

Critical Impact

An unauthenticated attacker can chain CSRF with Stored XSS to inject persistent JavaScript into the WordPress site, enabling session theft, administrative account takeover, and arbitrary client-side actions against site visitors.

Affected Products

• wphocus My auctions allegro (my-auctions-allegro-free-edition) WordPress plugin
• All versions from n/a through 3.6.33
• WordPress installations with the vulnerable plugin enabled

Discovery Timeline

• 2025-04-14 - CVE-2025-27009 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-27009

Vulnerability Analysis

The vulnerability exists because the plugin processes state-changing requests without verifying a valid anti-CSRF token (WordPress nonce). An attacker crafts a malicious HTML page that issues a forged POST request to a vulnerable plugin endpoint. When an authenticated administrator visits this page, the browser automatically attaches session cookies, and the plugin processes the request as legitimate.

Because the targeted endpoint also fails to sanitize or escape user-controlled input before storing it, the forged request writes attacker-supplied JavaScript into the database. The injected payload is later rendered in plugin output, producing Stored XSS that executes for every subsequent visitor who loads the affected page.

The combination of CSRF and Stored XSS amplifies impact. Even though the attack vector is network-based and requires user interaction, the persisted payload runs in the context of the WordPress site origin, exposing cookies, the admin interface, and authenticated AJAX endpoints.

Root Cause

The root cause is missing CSRF protection (wp_verify_nonce() or check_admin_referer()) on plugin request handlers, combined with insufficient output encoding for stored values. WordPress provides built-in nonce APIs, but the affected handlers in my-auctions-allegro-free-edition do not enforce them through version 3.6.33.

Attack Vector

An attacker hosts a malicious page containing a hidden form or fetch() call targeting the vulnerable plugin endpoint on a victim WordPress site. Social engineering, such as a phishing email or comment link, lures an authenticated administrator to the page. The forged request executes silently and stores the XSS payload, which then runs against every visitor loading the affected output.

No verified proof-of-concept code is publicly available. Refer to the Patchstack Vulnerability Report for additional technical details.

Detection Methods for CVE-2025-27009

Indicators of Compromise

• Unexpected <script> tags, event handlers, or obfuscated JavaScript stored in plugin-related database tables or post metadata.
• Outbound HTTP requests from visitor browsers to unfamiliar domains immediately after loading pages rendered by the plugin.
• WordPress administrator sessions originating from unrecognized IP addresses or user agents following a CSRF lure.
• Unauthorized modifications to plugin settings or auction listings without corresponding admin activity logs.

Detection Strategies

• Audit the WordPress database for plugin-stored fields containing HTML, JavaScript, or encoded payloads such as javascript:, onerror=, or <script.
• Enforce a Content Security Policy (CSP) in report-only mode to surface unexpected inline script execution on plugin-rendered pages.
• Monitor web server logs for POST requests to plugin endpoints lacking a valid Referer header matching the site origin.

Monitoring Recommendations

• Centralize WordPress access logs and plugin activity into a SIEM for correlation against admin session timelines.
• Alert on writes to plugin database tables outside of expected administrative working hours.
• Track plugin version inventory across managed WordPress sites to identify hosts still running my-auctions-allegro-free-edition 3.6.33 or earlier.

How to Mitigate CVE-2025-27009

Immediate Actions Required

• Update the My auctions allegro plugin to a version released after 3.6.33 once the vendor publishes a fix, or deactivate and remove the plugin until a patch is available.
• Force a password reset and session invalidation for all WordPress administrator accounts on sites that ran the vulnerable plugin.
• Inspect the database for stored XSS payloads and purge any injected scripts before re-enabling public access.

Patch Information

Review the Patchstack Vulnerability Report for current patch status. The advisory documents the vulnerability through version 3.6.33; site operators should apply the vendor-supplied update as soon as it is released.

Workarounds

• Deactivate my-auctions-allegro-free-edition until a patched release is installed.
• Deploy a web application firewall (WAF) rule that blocks POST requests to plugin endpoints missing a valid WordPress nonce parameter or same-origin Referer header.
• Enforce a strict Content Security Policy that disallows inline scripts on pages rendered by the plugin to limit Stored XSS execution.

# Configuration example: WordPress-CLI commands to disable the vulnerable plugin
wp plugin deactivate my-auctions-allegro-free-edition
wp plugin status my-auctions-allegro-free-edition
# Search the database for potentially injected script tags
wp db query "SELECT option_id, option_name FROM wp_options WHERE option_value LIKE '%<script%';"