CVE-2019-9875 — AI Deep Analysis Summary

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

🚨 **Essence**: A code flaw in Sitecore's **Anti-CSRF module**. 💥 **Consequences**: Potential **Remote Code Execution (RCE)** via deserialization attacks. Critical integrity loss.

Q: Root Cause? (CWE/Flaw)

🛠️ **Root Cause**: **Improper Code Implementation**. 📉 **Flaw**: Design/implementation errors in the **Anti-CSRF module** logic. Allows bypassing security controls.

Q: Who is affected? (Versions/Components)

🏢 **Vendor**: Sitecore (Denmark). 📦 **Affected**: **Sitecore 9.1 and earlier versions**. ⚠️ **Component**: Anti-CSRF module.

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

💀 **Attacker Action**: Execute arbitrary code. 🔓 **Privileges**: Full **RCE** (Remote Code Execution). 📂 **Data**: Complete system compromise possible.

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

⚖️ **Threshold**: **Medium/High**. 🔑 **Auth**: Likely requires interaction with the Anti-CSRF mechanism. 📝 **Config**: Depends on specific deployment of Sitecore CMS.

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

📢 **Public Exp?**: **Yes**. 🔍 **Source**: Synacktiv advisory published. 📄 **Proof**: PDF advisory available detailing the CSRF deserialization RCE chain.

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

🔍 **Self-Check**: Scan for **Sitecore CMS** instances. 📋 **Version**: Verify if version is **≤ 9.1**. 🚩 **Indicator**: Check for vulnerable Anti-CSRF module implementation.

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

🛡️ **Fix**: **Yes**. 📥 **Action**: Update Sitecore to a patched version. 🔗 **Ref**: Check official Sitecore downloads page for updates.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: Implement **WAF rules**. 🛑 **Mitigation**: Block malicious deserialization payloads. 🔒 **Hardening**: Restrict access to Anti-CSRF endpoints.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. ⚡ **Priority**: Immediate patching required. 🚨 **Risk**: RCE is critical. Do not ignore.

Updated May 06, 2026

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 code flaw in Sitecore's **Anti-CSRF module**. <br>💥 **Consequences**: Potential **Remote Code Execution (RCE)** via deserialization attacks. Critical integrity loss.

Q2Root Cause? (CWE/Flaw)

🛠️ **Root Cause**: **Improper Code Implementation**. <br>📉 **Flaw**: Design/implementation errors in the **Anti-CSRF module** logic. Allows bypassing security controls.

Q3Who is affected? (Versions/Components)

🏢 **Vendor**: Sitecore (Denmark). <br>📦 **Affected**: **Sitecore 9.1 and earlier versions**. <br>⚠️ **Component**: Anti-CSRF module.

Q4What can hackers do? (Privileges/Data)

💀 **Attacker Action**: Execute arbitrary code. <br>🔓 **Privileges**: Full **RCE** (Remote Code Execution). <br>📂 **Data**: Complete system compromise possible.

Q5Is exploitation threshold high? (Auth/Config)

⚖️ **Threshold**: **Medium/High**. <br>🔑 **Auth**: Likely requires interaction with the Anti-CSRF mechanism. <br>📝 **Config**: Depends on specific deployment of Sitecore CMS.

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

📢 **Public Exp?**: **Yes**. <br>🔍 **Source**: Synacktiv advisory published. <br>📄 **Proof**: PDF advisory available detailing the CSRF deserialization RCE chain.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for **Sitecore CMS** instances. <br>📋 **Version**: Verify if version is **≤ 9.1**. <br>🚩 **Indicator**: Check for vulnerable Anti-CSRF module implementation.

Q8Is it fixed officially? (Patch/Mitigation)

🛡️ **Fix**: **Yes**. <br>📥 **Action**: Update Sitecore to a patched version. <br>🔗 **Ref**: Check official Sitecore downloads page for updates.

Q9What if no patch? (Workaround)

🚧 **No Patch?**: Implement **WAF rules**. <br>🛑 **Mitigation**: Block malicious deserialization payloads. <br>🔒 **Hardening**: Restrict access to Anti-CSRF endpoints.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. <br>⚡ **Priority**: Immediate patching required. <br>🚨 **Risk**: RCE is critical. Do not ignore.

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