CVE-2024-9511 — AI Deep Analysis Summary

Q: What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A PHP Object Injection flaw in FluentSMTP. 💥 **Consequences**: Attackers can inject malicious PHP objects, leading to full system compromise, data theft, or site defacement.

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-502 (Deserialization of Untrusted Data). 🔍 **Flaw**: The plugin fails to properly sanitize input before deserializing PHP objects, allowing arbitrary code execution.

Q: Who is affected? (Versions/Components)

📦 **Affected**: WordPress Plugin **FluentSMTP**. 📅 **Version**: v2.2.82 and **all earlier versions**. 🏢 **Vendor**: techjewel.

Q: What can hackers do? (Privileges/Data)

👑 **Privileges**: High. 📂 **Data**: Full Control (C:H, I:H, A:H). ⚠️ **Impact**: Complete server takeover, sensitive data exfiltration, and malicious code injection.

Q: Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: **LOW**. 🔓 **Auth**: No authentication required (PR:N). 🌐 **Access**: Network accessible (AV:N). 👀 **UI**: No user interaction needed (UI:N).

Q: Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exp?**: **Yes**. 🔗 **Proof**: References provided by WordFence and WordPress Trac confirm the vulnerability path in `Logger.php`. 🚀 **Status**: Wild exploitation is likely given the low barrier.

Q: How to self-check? (Features/Scanning)

🔍 **Self-Check**: 1. Check plugin version in WP Dashboard. 2. Scan for `Logger.php` file in `app/Models/`. 3. Use vulnerability scanners targeting CWE-502 in WP plugins.

Q: Is it fixed officially? (Patch/Mitigation)

🩹 **Fixed?**: **Yes**. 📦 **Patch**: Updates available via WordPress Trac (Changeset 3194359 & 3194555). ✅ **Action**: Update to the latest version immediately.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: 1. **Disable** the FluentSMTP plugin immediately. 2. **Remove** the plugin files if not needed. 3. Monitor `Logger.php` for unauthorized modifications.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. ⏱️ **Priority**: **P0 - Immediate Action Required**. 📉 **Risk**: CVSS 9.8 (High). Zero-day potential for automated attacks.

Updated May 08, 2026 CVSS 9.8 · Critical

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A PHP Object Injection flaw in FluentSMTP. <br>💥 **Consequences**: Attackers can inject malicious PHP objects, leading to full system compromise, data theft, or site defacement.

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-502 (Deserialization of Untrusted Data). <br>🔍 **Flaw**: The plugin fails to properly sanitize input before deserializing PHP objects, allowing arbitrary code execution.

Q3Who is affected? (Versions/Components)

📦 **Affected**: WordPress Plugin **FluentSMTP**. <br>📅 **Version**: v2.2.82 and **all earlier versions**. <br>🏢 **Vendor**: techjewel.

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: High. <br>📂 **Data**: Full Control (C:H, I:H, A:H). <br>⚠️ **Impact**: Complete server takeover, sensitive data exfiltration, and malicious code injection.

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: **LOW**. <br>🔓 **Auth**: No authentication required (PR:N). <br>🌐 **Access**: Network accessible (AV:N). <br>👀 **UI**: No user interaction needed (UI:N).

Q6Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exp?**: **Yes**. <br>🔗 **Proof**: References provided by WordFence and WordPress Trac confirm the vulnerability path in `Logger.php`. <br>🚀 **Status**: Wild exploitation is likely given the low barrier.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: <br>1. Check plugin version in WP Dashboard. <br>2. Scan for `Logger.php` file in `app/Models/`. <br>3. Use vulnerability scanners targeting CWE-502 in WP plugins.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Fixed?**: **Yes**. <br>📦 **Patch**: Updates available via WordPress Trac (Changeset 3194359 & 3194555). <br>✅ **Action**: Update to the latest version immediately.

Q9What if no patch? (Workaround)

🚧 **No Patch?**: <br>1. **Disable** the FluentSMTP plugin immediately. <br>2. **Remove** the plugin files if not needed. <br>3. Monitor `Logger.php` for unauthorized modifications.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. <br>⏱️ **Priority**: **P0 - Immediate Action Required**. <br>📉 **Risk**: CVSS 9.8 (High). Zero-day potential for automated attacks.

Continue exploring

Vulnerability detail Full AI analysis (login) techjewel CWE-502