Comprehensive Technical Analysis of CVE-2025-47552

CVE ID: CVE-2025-47552 Vulnerability Type: PHP Object Injection via Deserialization of Untrusted Data Affected Software: Digital Zoom Studio (DZS) Video Gallery (WordPress Plugin) Affected Versions: All versions up to and including 12.37 CVSS Score: 9.8 (Critical) (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) Published: January 7, 2026 Source: PatchStack Vulnerability Database

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1. Vulnerability Assessment & Severity Evaluation

Technical Overview

CVE-2025-47552 is a PHP Object Injection vulnerability stemming from insecure deserialization of untrusted data in the DZS Video Gallery WordPress plugin. The flaw allows attackers to inject malicious serialized objects into the application, leading to arbitrary code execution (ACE), remote code execution (RCE), or other high-impact attacks.

Severity Justification (CVSS 9.8 - Critical)

CVSS Metric	Value	Explanation
Attack Vector (AV)	Network (N)	Exploitable remotely over the internet.
Attack Complexity (AC)	Low (L)	No special conditions required; straightforward exploitation.
Privileges Required (PR)	None (N)	No authentication or elevated privileges needed.
User Interaction (UI)	None (N)	Exploitable without user interaction.
Scope (S)	Unchanged (U)	Impact is confined to the vulnerable component.
Confidentiality (C)	High (H)	Attacker can access sensitive data (e.g., database credentials, files).
Integrity (I)	High (H)	Attacker can modify files, inject backdoors, or alter application logic.
Availability (A)	High (H)	Attacker can crash the system or render it unusable.

Key Takeaways:

• Unauthenticated RCE is possible if the vulnerable code path is exposed.
• No user interaction is required, making it highly exploitable in automated attacks.
• High impact on confidentiality, integrity, and availability (CIA triad).

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Mechanism

PHP Object Injection occurs when an application deserializes untrusted data without proper validation or sanitization. Attackers exploit this by:

1. Crafting a malicious serialized payload containing arbitrary PHP objects.
2. Injecting the payload into a vulnerable input field (e.g., HTTP request parameters, cookies, or file uploads).
3. Triggering deserialization, leading to:
   • Arbitrary file writes (e.g., .php backdoors).
   • Remote code execution (RCE) via magic methods (__wakeup(), __destruct()).
   • Privilege escalation if the deserialized object interacts with sensitive functions.

Likely Attack Vectors

1. HTTP Request Manipulation

   • The plugin may deserialize data from:
     • GET/POST parameters (e.g., ?data=malicious_payload).
     • Cookies (e.g., PHPSESSID or custom plugin cookies).
     • File uploads (e.g., video metadata processing).
   • Example:

     POST /wp-admin/admin-ajax.php?action=dzs_videogallery_ajax HTTP/1.1
     Host: vulnerable-site.com
     Content-Type: application/x-www-form-urlencoded
     
     data=O:8:"Example":1:{s:4:"file";s:10:"/tmp/shell.php";}
     

2. Stored Object Injection (Second-Order Attack)

   • If the plugin stores serialized data in the database (e.g., video settings), an attacker could:
     • Upload a malicious video with crafted metadata.
     • Trigger deserialization when the video is loaded.

3. Chained Exploits

   • If the plugin interacts with other vulnerable components (e.g., file uploads, database queries), an attacker could:
     • Combine with file upload vulnerabilities to write a PHP shell.
     • Exploit weak file permissions to execute arbitrary code.

Proof-of-Concept (PoC) Exploitation

A typical exploitation flow might involve:

1. Identifying the vulnerable endpoint (e.g., via source code review or fuzzing).
2. Crafting a serialized payload using a gadget chain (e.g., from WordPress core or other plugins).
3. Sending the payload to the vulnerable parameter.
4. Triggering deserialization to achieve RCE.

Example Gadget Chain (Hypothetical):

// Malicious serialized payload
O:10:"EvilObject":2:{
  s:4:"file";s:19:"/var/www/shell.php";
  s:4:"data";s:25:"<?php system($_GET['cmd']); ?>";
}

• If the plugin deserializes this and calls __wakeup() or __destruct(), it may write the PHP shell to disk.

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3. Affected Systems & Software Versions

Vulnerable Software

• Plugin Name: DZS Video Gallery (WordPress Plugin)
• Vendor: Digital Zoom Studio
• Affected Versions: All versions up to and including 12.37
• Platform: WordPress (self-hosted installations)

Attack Surface

• WordPress Websites using the DZS Video Gallery plugin.
• Shared Hosting Environments where multiple sites may be affected.
• E-commerce or Media-Heavy Sites that rely on video galleries.

Detection Methods

• Manual Inspection:
  • Check plugin version (/wp-content/plugins/dzs-videogallery/readme.txt).
  • Review code for unserialize() calls without proper validation.
• Automated Scanning:
  • WordPress Vulnerability Scanners (e.g., WPScan, PatchStack).
  • Static Application Security Testing (SAST) tools (e.g., SonarQube, Semgrep).
  • Dynamic Analysis (e.g., Burp Suite, OWASP ZAP) to detect deserialization endpoints.

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4. Recommended Mitigation Strategies

Immediate Actions

1. Apply the Patch

   • Upgrade to the latest version (if available) or apply vendor-provided fixes.
   • If no patch exists, disable the plugin until a fix is released.

2. Temporary Workarounds

   • Input Validation & Sanitization:
     • Replace unserialize() with json_decode() (if possible).
     • Implement strict allowlisting for serialized data.
   • Disable Dangerous Functions:
     • Restrict PHP functions like eval(), system(), exec(), passthru().
   • Web Application Firewall (WAF) Rules:
     • Block requests containing serialized payloads (e.g., O:[0-9]+:).
     • Use ModSecurity OWASP Core Rule Set (CRS) to detect deserialization attacks.

3. Network-Level Protections

   • Isolate WordPress Instances in a DMZ or behind a reverse proxy.
   • Rate-Limit Requests to vulnerable endpoints to prevent brute-force attacks.

Long-Term Mitigations

1. Secure Coding Practices

   • Avoid unserialize() – Use JSON or XML for data exchange.
   • Implement Digital Signatures for serialized data to ensure integrity.
   • Use Safe Deserialization Libraries (e.g., PHP’s igbinary with strict mode).

2. Runtime Protections

   • Disable PHP Object Injection Gadgets (e.g., using PHPGGC to identify and block gadget chains).
   • Enable PHP’s unserialize_callback_func to restrict allowed classes.

3. Monitoring & Detection

   • Log Deserialization Attempts (e.g., failed unserialize() calls).
   • Deploy Intrusion Detection Systems (IDS) (e.g., Snort, Suricata) to detect exploitation attempts.
   • Regular Vulnerability Scanning (e.g., Nessus, OpenVAS).

4. Incident Response Planning

   • Develop a Playbook for deserialization vulnerabilities.
   • Isolate Affected Systems if exploitation is detected.
   • Forensic Analysis to determine if data was exfiltrated or backdoors were installed.

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5. Impact on the Cybersecurity Landscape

Broader Implications

1. Increased Attack Surface for WordPress Sites

   • WordPress powers ~43% of all websites, making plugins like DZS Video Gallery high-value targets.
   • Automated Exploit Kits (e.g., WPScan, Metasploit modules) may emerge, leading to mass exploitation.

2. Supply Chain Risks

   • If the plugin is used in third-party themes or services, the vulnerability could propagate to other systems.
   • Compromised WordPress sites may be used for SEO poisoning, malware distribution, or botnet recruitment.

3. Regulatory & Compliance Risks

   • GDPR, CCPA, HIPAA: Unauthorized data access could lead to legal penalties.
   • PCI DSS: If the site processes payments, RCE could lead to credit card theft.

4. Economic Impact

   • Downtime & Recovery Costs for affected businesses.
   • Reputation Damage leading to loss of customer trust.

Historical Context

• Similar Vulnerabilities:
  • CVE-2017-1000487 (WordPress PHPMailer RCE via object injection).
  • CVE-2019-6977 (WordPress GDPR Compliance Plugin RCE).
• Lessons Learned:
  • Deserialization vulnerabilities are often underestimated but can lead to full system compromise.
  • Plugin security is critical – many WordPress breaches originate from vulnerable plugins.

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6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerability likely stems from:

1. Unsafe Deserialization in Plugin Code
   • Example vulnerable code snippet:

     $data = $_POST['data'];
     $object = unserialize($data); // UNSAFE: No validation
     

2. Lack of Input Validation
   • No checks for malicious object types or gadget chains.
3. Insecure Use of Magic Methods
   • If the plugin defines classes with __wakeup() or __destruct() that perform dangerous operations (e.g., file writes), attackers can exploit them.

Exploitation Requirements

• Preconditions:
  • The vulnerable endpoint must be accessible (e.g., /wp-admin/admin-ajax.php).
  • The attacker must know or guess the parameter name (e.g., data).
  • A gadget chain must exist (either in the plugin or WordPress core).
• Tools for Exploitation:
  • PHPGGC (PHP Generic Gadget Chains) to generate payloads.
  • Burp Suite / OWASP ZAP for manual testing.
  • Metasploit (if a module is developed).

Forensic Indicators of Compromise (IoCs)

Indicator	Description
Log Entries	unserialize() errors in PHP logs.
Suspicious Files	Unexpected .php files in /wp-content/uploads/.
Network Traffic	Outbound connections to attacker-controlled servers.
Database Anomalies	Unauthorized changes in wp_options or plugin tables.
Process Execution	Unexpected bash, python, or curl processes.

Reverse Engineering & Patch Analysis

1. Diff Analysis (If Patch is Available)
   • Compare vulnerable and patched versions to identify:
     • Replacement of unserialize() with json_decode().
     • Addition of input validation (e.g., is_serialized() checks).
     • Removal of dangerous magic methods.
2. Static Analysis
   • Use Ghidra, IDA Pro, or Binary Ninja to analyze the plugin’s PHP bytecode (if obfuscated).
   • Search for unserialize() calls and trace data flow.

Advanced Mitigation Techniques

1. PHP Hardening
   • Disable unserialize() via disable_functions in php.ini.
   • Enable open_basedir to restrict file operations.
2. Runtime Application Self-Protection (RASP)
   • Deploy RASP solutions (e.g., Signal Sciences, Contrast Security) to block deserialization attacks.
3. Containerization & Sandboxing
   • Run WordPress in a Docker container with read-only filesystems.
   • Use gVisor or Firecracker for additional isolation.

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Conclusion & Recommendations

Key Takeaways

• CVE-2025-47552 is a critical PHP Object Injection vulnerability with CVSS 9.8, enabling unauthenticated RCE.
• Exploitation is straightforward if the vulnerable endpoint is exposed, making it a prime target for automated attacks.
• Immediate patching is essential – if no patch exists, disable the plugin or implement WAF rules as a temporary measure.

Action Plan for Security Teams

Priority	Action	Owner
Critical	Apply vendor patch or disable plugin.	IT / DevOps
High	Deploy WAF rules to block serialized payloads.	Security Team
Medium	Audit WordPress plugins for similar vulnerabilities.	Security Team
Low	Implement secure coding guidelines for future development.	Dev Team

Final Recommendations

1. Patch Immediately – Prioritize this vulnerability due to its critical severity.
2. Monitor for Exploitation – Set up alerts for deserialization attempts.
3. Educate Developers – Train teams on secure deserialization practices.
4. Prepare for Incident Response – Assume breach and plan containment steps.

By addressing CVE-2025-47552 proactively, organizations can prevent RCE attacks, data breaches, and reputational damage associated with this high-risk vulnerability.

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References:

• PatchStack Advisory
• OWASP Deserialization Cheat Sheet
• PHPGGC (PHP Generic Gadget Chains)