CVE-2026-3296 — AI Deep Analysis Summary

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

🚨 **Essence**: Unauthenticated PHP Object Injection via deserialization of untrusted input in form metadata. 💥 **Consequences**: Full server compromise, data theft, or site defacement. Critical severity (CVSS 9.8).

Q: Root Cause? (CWE/Flaw)

🛡️ **CWE-502**: Deserialization of Untrusted Data. 🐛 **Flaw**: The plugin deserializes form entry metadata without proper validation, allowing attackers to inject malicious PHP objects.

Q: Who is affected? (Versions/Components)

📦 **Vendor**: WPEverest. 📉 **Affected Product**: Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder. ⚠️ **Version**: 3.4.3 and earlier.

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

🕵️ **Attacker Actions**: Inject serialized PHP payloads. 🎯 **Impact**: Gain arbitrary code execution. Access sensitive data (C:H), modify site content (I:H), or crash the server (A:H). No authentication required.

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

🔓 **Threshold**: LOW. 🚫 **Auth**: None required (PR:N). 🌐 **Access**: Network accessible (AV:N). 🖱️ **User Interaction**: None needed (UI:N). Easy to exploit remotely.

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

📂 **Public Exp**: No specific PoC code provided in data. 🔍 **References**: Links to WordPress Trac and WordFence exist, indicating awareness but no public exploit script confirmed in this dataset.

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

🔍 **Check**: Scan for 'Everest Forms' plugin. 📊 **Version**: Verify if version ≤ 3.4.3. 🛠️ **Tool**: Use WordPress security scanners or check `evf-core-functions.php` for unsafe `unserialize()` calls on metadata.

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

✅ **Fixed**: Yes. 📅 **Patch Date**: 2026-04-08. 🔄 **Update**: Upgrade to version 3.4.4. 📝 **Ref**: Changeset 3489938 addresses the issue.

Q: Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL. 🚀 **Action**: Patch IMMEDIATELY. ⚡ **Reason**: Unauthenticated, high CVSS score, and direct code execution risk. Do not delay.

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**: Unauthenticated PHP Object Injection via deserialization of untrusted input in form metadata. 💥 **Consequences**: Full server compromise, data theft, or site defacement. Critical severity (CVSS 9.8).

Q2Root Cause? (CWE/Flaw)

🛡️ **CWE-502**: Deserialization of Untrusted Data. 🐛 **Flaw**: The plugin deserializes form entry metadata without proper validation, allowing attackers to inject malicious PHP objects.

Q3Who is affected? (Versions/Components)

📦 **Vendor**: WPEverest. 📉 **Affected Product**: Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder. ⚠️ **Version**: 3.4.3 and earlier.

Q4What can hackers do? (Privileges/Data)

🕵️ **Attacker Actions**: Inject serialized PHP payloads. 🎯 **Impact**: Gain arbitrary code execution. Access sensitive data (C:H), modify site content (I:H), or crash the server (A:H). No authentication required.

Q5Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: LOW. 🚫 **Auth**: None required (PR:N). 🌐 **Access**: Network accessible (AV:N). 🖱️ **User Interaction**: None needed (UI:N). Easy to exploit remotely.

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

📂 **Public Exp**: No specific PoC code provided in data. 🔍 **References**: Links to WordPress Trac and WordFence exist, indicating awareness but no public exploit script confirmed in this dataset.

Q7How to self-check? (Features/Scanning)

🔍 **Check**: Scan for 'Everest Forms' plugin. 📊 **Version**: Verify if version ≤ 3.4.3. 🛠️ **Tool**: Use WordPress security scanners or check `evf-core-functions.php` for unsafe `unserialize()` calls on metadata.

Q8Is it fixed officially? (Patch/Mitigation)

✅ **Fixed**: Yes. 📅 **Patch Date**: 2026-04-08. 🔄 **Update**: Upgrade to version 3.4.4. 📝 **Ref**: Changeset 3489938 addresses the issue.

Q9What if no patch? (Workaround)

🚧 **Workaround**: Disable the plugin if not essential. 🛑 **Mitigation**: Restrict access to form submission endpoints. 🧹 **Clean**: Remove old form entries containing suspicious metadata.…

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Q10Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL. 🚀 **Action**: Patch IMMEDIATELY. ⚡ **Reason**: Unauthenticated, high CVSS score, and direct code execution risk. Do not delay.

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