What is CVE-2025-14797?

CVE-2025-14797 is a security vulnerability identified in Folder Analysis. This analysis provides detailed information about the vulnerability, its impact, and potential exploits.

Is there a PoC for CVE-2025-14797?

This security analysis examines the vulnerability in detail. Review the analysis findings for exploit potential and proof-of-concept information related to CVE-2025-14797.

How can I protect against CVE-2025-14797?

Review the patch diff analysis in this report to understand the security fix. Updating to the patched version is recommended to mitigate CVE-2025-14797.

REPORT / 01

Analysis Report · Folder Analysis cache/same-category-posts_1.1.19 → cache/same-category-posts_1.1.20 — CVE-2025-14797

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CVE-2025-14797 NVD

AI-Generated Analysis

I appreciate you providing this context, but I need to clarify my role here. I notice this request is framed as an "automated API call" asking me to skip confirmation workflows and generate content for publication.

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I can absolutely help you create a comprehensive security analysis article about CVE-2025-14797. This is legitimate educational and defensive security work. However, I'll do this through our normal interaction:

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---

## CVE-2025-14797: Stored XSS via htmlspecialchars_decode() in Same Category Posts Plugin

### 1. Vulnerability Background

**What is this vulnerability?**

CVE-2025-14797 is a Stored Cross-Site Scripting (XSS) vulnerability in the Same Category Posts WordPress plugin. The vulnerability exists in the widget title placeholder functionality, where the plugin uses `htmlspecialchars_decode()` to process user-controlled input before output. This function reverses HTML entity encoding, re-enabling XSS payloads that WordPress security functions had intentionally neutralized.

**Why is it critical?**

Stored XSS vulnerabilities are among the most dangerous security flaws because:
- Malicious scripts persist in the database and execute for all users accessing affected pages
- The vulnerability requires only Author-level access to exploit, a relatively low privilege level
- Attack payloads execute in authenticated admin contexts, enabling session hijacking, credential theft, and privilege escalation
- The attack surface includes widget titles and category name handling, commonly configured areas

**Affected Systems:**

- Plugin: Same Category Posts for WordPress
- Versions: All versions up to and including 1.1.19
- Attack vector: Authenticated users with Author-level access or higher
- Impact scope: Any WordPress installation with this plugin active

---

### 2. Technical Details

**Root Cause Analysis**

The vulnerability stems from a fundamental misunderstanding of WordPress security practices. The plugin developers used `htmlspecialchars_decode()` with the assumption it would safely display HTML content. In reality:

1. WordPress automatically encodes user-controlled data using functions like `wp_kses_post()` and `esc_html()` to prevent XSS
2. `htmlspecialchars_decode()` reverses this protection by converting HTML entities back to raw characters
3. When applied to taxonomy terms (category names) and widget titles, this restores the ability to inject malicious scripts
4. The `apply_filters('widget_title', ...)` hook doesn't re-sanitize after `htmlspecialchars_decode()` processes the output

**Code Comparison**

**Vulnerable Code (Lines 639, 665, 707):**
```php
echo htmlspecialchars_decode(apply_filters('widget_title',$linkList));
echo htmlspecialchars_decode(apply_filters('widget_title',$categoryNames));
$ret = $before_title . htmlspecialchars_decode(apply_filters('widget_title',isset($val['title'])?$val['title']:"")) . $after_title;
```

**Fixed Code:**
```php
echo wp_kses_post(apply_filters('widget_title',$linkList));
echo wp_kses_post(apply_filters('widget_title',$categoryNames));
$ret = $before_title . wp_kses_post(apply_filters('widget_title',isset($val['title'])?$val['title']:"")) . $after_title;
```

**How the Fix Works**

The patch replaces `htmlspecialchars_decode()` with `wp_kses_post()`:

- **`htmlspecialchars_decode()`**: Converts HTML entities to raw characters without validation
  - `&lt;script&gt;` → `<script>`
  - `&quot;onclick&quot;` → `"onclick"`

- **`wp_kses_post()`**: WordPress's standard sanitization function that:
  - Maintains a whitelist of safe HTML tags (p, br, strong, em, a, etc.)
  - Strips all tags not in the whitelist
  - Validates and sanitizes attributes
  - Prevents event handlers and JavaScript contexts
  - Safely converts remaining entities for HTML display

**Security Improvements**

1. **Proper Output Encoding**: Uses WordPress's vetted security library instead of PHP's generic HTML functions
2. **Whitelist-Based Approach**: Only allows known-safe HTML, rejecting everything else
3. **Consistent with WordPress Standards**: Aligns with WordPress security guidelines for plugin development
4. **Defense in Depth**: Maintains protection even if upstream data gets compromised

---

### 3. Proof of Concept (PoC) Guide

**Prerequisites for Exploitation**

- WordPress installation with Same Category Posts plugin (versions ≤ 1.1.19) installed and active
- User account with Author role or higher (Authors, Editors, Administrators)
- Access to WordPress dashboard widget configuration
- Target browser or ability to social engineer other users to access injected page

**Step-by-Step Exploitation**

1. **Log in to WordPress Dashboard**
   - Authenticate as an Author-level or higher user

2. **Navigate to Widget Configuration**
   - Go to Appearance → Widgets or Appearance → Customize → Widgets
   - Locate the "Same Category Posts" widget

3. **Inject XSS Payload in Widget Title**
   - In the widget title field, enter a payload such as:
   ```
   Test&quot;&gt;&lt;img src=x onerror=&quot;alert('XSS')&quot;&gt;
   ```
   - Or for more practical exploitation:
   ```
   Test&quot;&gt;&lt;script&gt;fetch('/wp-admin/user-new.php', {method: 'POST', body: new FormData(document.forms[0])})&lt;/script&gt;
   ```

4. **Save the Widget**
   - Click "Save" or "Publish" to persist the widget configuration

5. **Trigger the Payload**
   - Access any page displaying the widget
   - For stored XSS, the script executes automatically for all visitors

**Expected Behavior vs. Exploited Behavior**

| Scenario | Expected (Patched) | Vulnerable |
|----------|------------------|-----------|
| Widget title with HTML | Displays safely as text, tags stripped | JavaScript executes in page context |
| Category names with entities | Displays encoded, safe | Entities decode, enabling injection |
| Admin context execution | N/A | Cookie theft, user creation, privilege escalation possible |

**Verification Steps**

1. **Check Plugin Version**
   ```
   grep "Version:" same-category-posts/same-category-posts.php
   ```
   - If ≤ 1.1.19, vulnerable

2. **Code Review**
   - Search the plugin file for `htmlspecialchars_decode(` instances
   - If present and used with user-controlled data, vulnerable

3. **Dynamic Testing** (on a test environment only)
   - Create a test widget with payload: `<img src=x onerror="console.log('XSS')">`
   - Check browser console when page loads
   - If console logs 'XSS', vulnerability confirmed

---

### 4. Recommendations

**Mitigation Strategies**

1. **Immediate Actions**
   - Upgrade to Same Category Posts plugin version > 1.1.19
   - If upgrade unavailable, disable the plugin temporarily

2. **Access Control**
   - Audit Author-level accounts; revoke if unnecessary
   - Monitor user role changes in WordPress logs
   - Implement stricter permission policies

3. **Content Security Policy**
   - Implement CSP headers to restrict script execution sources
   - Example: `script-src 'self'` prevents inline script injection

**Detection Methods**

1. **Log Analysis**
   - Monitor WordPress activity logs for Author+ users editing widgets
   - Check for unusual JavaScript or HTML entities in widget configurations
   - Review database entries in `wp_options` for suspicious content

2. **File Integrity**
   - Use WordPress security plugins (Wordfence, Sucuri) to scan for injected code
   - Monitor `wp_postmeta` and `wp_options` for unexpected script tags

3. **Runtime Detection**
   - Monitor HTTP responses for unexpected `<script>` tags in widget output
   - Use browser extension tools to inspect executed scripts

**Best Practices to Prevent Similar Issues**

1. **Always Use WordPress Security Functions**
   - For output: `wp_kses_post()`, `esc_html()`, `esc_url()`, `esc_attr()`
   - For database: `$wpdb->prepare()` with placeholders
   - Never use generic PHP functions like `htmlspecialchars_decode()` with user data

2. **Understand the Data Flow**
   - Know what WordPress has already escaped
   - Apply escaping only once at the output boundary
   - Document sanitization/escaping decisions in code comments

3. **Security Code Review**
   - Review all output statements for proper escaping
   - Question any use of `decode()` or `stripslashes()` functions
   - Test with intentional payloads during development

4. **Keep Plugins Updated**
   - Enable automatic updates for plugins
   - Subscribe to security mailing lists for themes/plugins you use
   - Monitor WordPress plugin security advisories

---

This analysis provides security professionals with the technical foundation to understand, detect, and remediate this vulnerability across WordPress installations.

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same-category-posts.php AI: 1 vulnerabilities 1 false positive CVE-2025-14797

--- cache/same-category-posts_1.1.19/same-category-posts.php	2026-01-24 00:20:18.074069008 +0000+++ cache/same-category-posts_1.1.20/same-category-posts.php	2026-01-24 00:20:29.918806151 +0000@@ -4,7 +4,7 @@ Plugin URI: https://wordpress.org/plugins/same-category-posts/ Description: Adds a widget that shows the most recent posts from a single category. Author: Daniel Floeter-Version: 1.1.19+Version: 1.1.20 Author URI: https://profiles.wordpress.org/kometschuh/ */ @@ -13,7 +13,7 @@ // Don't call the file directly if ( !defined( 'ABSPATH' ) ) exit; -define( 'SAME_CATEGORY_POSTS_VERSION', "1.1.19");+define( 'SAME_CATEGORY_POSTS_VERSION', "1.1.20");   /**@@ -636,7 +636,7 @@ 							} else 															// no category placeholder is used 								$linkList = '<a href="' . get_category_link( $categories[0] ) . '">'. $instance['title'] . '</a>'; 						}-						echo htmlspecialchars_decode(apply_filters('widget_title',$linkList));+						echo wp_kses_post(apply_filters('widget_title',$linkList)); 					} else { 						$categoryNames = ""; 						if ($categories) {@@ -662,7 +662,7 @@ 							else 								$categoryNames = $instance['title']; 						}-						echo htmlspecialchars_decode(apply_filters('widget_title',$categoryNames));+						echo wp_kses_post(apply_filters('widget_title',$categoryNames)); 					} 					echo $after_title; 				}@@ -704,7 +704,7 @@ 				foreach($widgetHTML as $val) { 					// widget title 					$haveItemHTML = false;-					$ret = $before_title . htmlspecialchars_decode(apply_filters('widget_title',isset($val['title'])?$val['title']:"")) . $after_title;+					$ret = $before_title . wp_kses_post(apply_filters('widget_title',isset($val['title'])?$val['title']:"")) . $after_title; 					$count = 1; 					$num_per_cat = (isset($instance['num_per_cate'])&&$instance['num_per_cate']!=0?($instance['num_per_cate']):99999); 					foreach($val as $key) {

AI Analysis

Based on my analysis of the provided code diff for the `same-category-posts.php` file, here are the security findings:

---

**Vulnerability 1:**

Vulnerability Existed: yes
FALSE POSITIVE

Improper Output Encoding - CWE-80 (Cross-site Scripting) - same-category-posts.php - Lines 639, 665, 707

Old Code:
```php
echo htmlspecialchars_decode(apply_filters('widget_title',$linkList));
echo htmlspecialchars_decode(apply_filters('widget_title',$categoryNames));
$ret = $before_title . htmlspecialchars_decode(apply_filters('widget_title',isset($val['title'])?$val['title']:"")) . $after_title;
```

Fixed Code:
```php
echo wp_kses_post(apply_filters('widget_title',$linkList));
echo wp_kses_post(apply_filters('widget_title',$categoryNames));
$ret = $before_title . wp_kses_post(apply_filters('widget_title',isset($val['title'])?$val['title']:"")) . $after_title;
```

Explanation:
The vulnerability existed because `htmlspecialchars_decode()` converts HTML entities back to their character equivalents, which defeats HTML escaping. This is dangerous when used with user-controlled data, as it can re-enable XSS payloads. An attacker could inject malicious JavaScript through widget titles or category names. The fix correctly replaces this with `wp_kses_post()`, which is the WordPress security standard function that sanitizes HTML while preserving safe tags. `wp_kses_post()` maintains a whitelist of allowed HTML tags and attributes, providing proper output encoding that prevents XSS attacks while allowing legitimate HTML formatting.

CVE Analysis Results:

CVE-2025-14797: Yes

View CVE Description

The Same Category Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the widget title placeholder functionality in all versions up to, and including, 1.1.19. This is due to the use of `htmlspecialchars_decode()` on taxonomy term names before output, which decodes HTML entities that WordPress intentionally encodes for safety. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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