CVE-2025-48361

Executive Summary

CVE-2025-48361 is a vulnerability in the Hesabfa Accounting WordPress plugin (versions <= 2.2.5) developed by Saeed Sattar Beglou. The flaw is classified as an Insertion of Sensitive Information Into Sent Data (CWE-201). This allows an unauthenticated attacker to retrieve embedded sensitive data from the plugin’s responses, potentially exposing API keys, tokens, or other secrets that are inadvertently included in client-side data transmissions.

The vulnerability is unpatched as of the latest advisory, and no public exploit code or proof-of-concept (PoC) is available. The CVSS score is 5.3 (Medium), with a low EPSS score (0.0%), indicating low exploitation likelihood in the wild at this time.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin from the repository are at risk. No package manager (NPM, PyPI, Go, Ruby) is involved, but the plugin’s update mechanism is critical. Since no patch exists, users must manually remove or disable the plugin until a fix is released.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Base Score: 5.3 (Medium)
• Attack Vector: Network (AV:N) – exploitable remotely.
• Attack Complexity: Low (AC:L) – no special conditions required.
• Privileges Required: None (PR:N) – unauthenticated.
• User Interaction: None (UI:N) – no user action needed.
• Scope: Unchanged (S:U) – impact confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – limited sensitive data exposure.
• Integrity Impact: None (I:N) – no data modification.
• Availability Impact: None (A:N) – no denial of service.

Threat Level: Medium. The vulnerability allows data leakage but not full system compromise. However, if the leaked data includes API keys or credentials, the impact could escalate.

Deep Dive & Mechanics

The vulnerability resides in the Hesabfa Accounting plugin’s data transmission logic. The plugin likely sends sensitive information (e.g., API tokens, database credentials, or internal configuration) as part of HTTP responses or AJAX calls intended for legitimate functionality. An attacker can intercept these responses by:

1. Direct HTTP requests to endpoints that return sensitive data.
2. Man-in-the-Middle (MitM) attacks if HTTPS is not enforced.
3. Cross-Site Scripting (XSS) combined with data exfiltration (though not required for exploitation).

The sensitive data is embedded in the response body, headers, or JavaScript variables. For example, the plugin might include an API key in a JavaScript object for client-side use, which is then exposed to any user who views the page source or network traffic.

Root Cause: Lack of proper data sanitization and separation of client-side vs. server-side secrets. The plugin fails to restrict sensitive data to authenticated sessions or to obfuscate it from client-side inspection.

Vulnerable vs. Patched Code

Since no patch is available, we can only analyze the vulnerable code pattern. A typical vulnerable snippet might look like:

// Vulnerable: Exposes API key in JavaScript
function hesabfa_enqueue_scripts() {
    wp_localize_script('hesabfa-js', 'hesabfa_data', array(
        'api_key' => get_option('hesabfa_api_key'), // Sensitive data exposed
        'ajax_url' => admin_url('admin-ajax.php')
    ));
}

Patched version (hypothetical):

// Patched: Remove sensitive data from client-side
function hesabfa_enqueue_scripts() {
    wp_localize_script('hesabfa-js', 'hesabfa_data', array(
        'ajax_url' => admin_url('admin-ajax.php')
        // No API key exposed
    ));
}

The patch would involve removing any sensitive fields from client-side data and ensuring that API calls are authenticated server-side.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with Hesabfa Accounting plugin <= 2.2.5 installed.
• Network access to the site.

Steps:

1. Identify endpoints: Use a web proxy (e.g., Burp Suite) to intercept traffic and look for JavaScript files or AJAX responses containing sensitive data.
2. Extract data: Search for patterns like api_key, token, secret, or base64-encoded strings in the response body.
3. Automate: Use a script to fetch the plugin’s JavaScript files and parse for sensitive variables.

Example curl command:

curl -s "https://target.com/wp-content/plugins/hesabfa-accounting/assets/js/hesabfa.js" | grep -E "(api_key|token|secret)"

No public exploit code exists, so this is a manual reconnaissance process.

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual requests to plugin JavaScript files or AJAX endpoints.
• Look for patterns in logs indicating data exfiltration (e.g., repeated requests to hesabfa-accounting paths).

Defense:

• Immediate: Disable or remove the plugin until a patch is released.
• Network: Enforce HTTPS to prevent MitM attacks.
• WAF: Create rules to block requests containing sensitive keywords in responses (e.g., api_key).

Indicators of Compromise (IOCs)

• File paths: /wp-content/plugins/hesabfa-accounting/ (any file within this directory)
• Network patterns: HTTP responses containing hesabfa_data JavaScript object with api_key or similar fields.
• Log entries: Requests to hesabfa-accounting endpoints from unauthenticated users.
• Strings: hesabfa_api_key, hesabfa_token, hesabfa_secret in response bodies.

Detection Engineering

YARA Rule

rule CVE_2025_48361_Hesabfa_Data_Leak {
    meta:
        description = "Detects sensitive data exposure in Hesabfa Accounting plugin responses"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-48361"
    strings:
        $s1 = "hesabfa_data" ascii wide nocase
        $s2 = "api_key" ascii wide nocase
        $s3 = "token" ascii wide nocase
        $s4 = "secret" ascii wide nocase
    condition:
        $s1 and any of ($s2, $s3, $s4)
}

Sigma Rule

title: CVE-2025-48361 - Hesabfa Accounting Sensitive Data Leak
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP responses containing sensitive data from Hesabfa Accounting plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-uri-stem:
            - "/wp-content/plugins/hesabfa-accounting/*"
        sc-status: 200
        cs-method: GET
    keywords:
        - "hesabfa_data"
        - "api_key"
        - "token"
    condition: selection and keywords
falsepositives:
    - Legitimate plugin functionality (if patched)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-48361 - Hesabfa Accounting Sensitive Data Leak"; flow:to_client,established; content:"hesabfa_data"; http_server_body; content:"api_key"; distance:0; within:100; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin via WordPress admin or by renaming the plugin folder (/wp-content/plugins/hesabfa-accounting).
2. Remove the plugin if not essential.
3. Rotate any API keys or secrets that may have been exposed.

Long-term:

• Monitor the plugin’s repository for a patched version (>= 2.2.6).
• Implement a Web Application Firewall (WAF) rule to block responses containing sensitive patterns.
• Educate developers on secure coding practices (e.g., never expose secrets client-side).

Workaround: If the plugin is critical, consider using a reverse proxy to strip sensitive data from responses, but this is not recommended.

Valters IT
Securing Digital Frontiers