CVE-2025-8943 — AI Deep Analysis Summary

Q: Who is affected? (Versions/Components)

📦 **Affected Versions** * **Flowise versions < 3.0.1** are vulnerable. 📉 * Some advisories suggest checking up to **3.0.5**. 🧐 * **Component:** `flowise-components` / Custom MCPs feature. 🧩

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

📉 **Exploitation Threshold: LOW** * **Network Access:** Only need HTTP access to the endpoint. 🌐 * **Authentication:** **NONE** required by default. 🔓 * **Complexity:** Low. Simple HTTP requests trigger RCE. 🚀

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

🔍 **Self-Check Steps** 1. **Check Version:** Is Flowise < 3.0.1? 📝 2. **Test Auth:** Try accessing `/api` without login. If it works, you're vulnerable! 🚨 3. **Scan:** Use Nuclei with the CVE-2025-8943 template. 🛠️

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

✅ **Official Fix Available** * **Patch:** Upgrade to **Flowise 3.0.1** or later. 🆙 * **Mitigation:** Enable authentication and configure RBAC immediately if you can't upgrade. 🔐

Q: Is it urgent? (Priority Suggestion)

🔥 **Priority: CRITICAL (P0)** * **CVSS:** 9.8 (Critical). 📊 * **Urgency:** Patch **IMMEDIATELY**. ⏳ * **Risk:** Active exploitation is likely due to public PoCs. 🚀

Updated May 06, 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)

🚨 **Critical RCE in Flowise!**

Flowise < 3.0.1 suffers from a **Remote Code Execution (RCE)** flaw. The 'Custom MCPs' feature allows OS command execution.…

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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause: Missing Auth & RBAC**

**No Default Auth:** Fresh installs have no login required. 🚫
**No RBAC:** No role-based access control. 🔓
…

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Q3Who is affected? (Versions/Components)

📦 **Affected Versions**

* **Flowise versions < 3.0.1** are vulnerable. 📉
* Some advisories suggest checking up to **3.0.5**. 🧐
* **Component:** `flowise-components` / Custom MCPs feature. 🧩

Q4What can hackers do? (Privileges/Data)

🎯 **Attacker Capabilities**

* **Full Control:** Execute arbitrary OS commands. 💻
* **Data Access:** Read/Write/Delete files. 📂
* **Privileges:** Run as the Flowise service user.…

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Q5Is exploitation threshold high? (Auth/Config)

📉 **Exploitation Threshold: LOW**

* **Network Access:** Only need HTTP access to the endpoint. 🌐
* **Authentication:** **NONE** required by default. 🔓
* **Complexity:** Low. Simple HTTP requests trigger RCE. 🚀

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

💣 **Public Exploits Available**

* **Nuclei Templates:** Public PoC exists (`CVE-2025-8943.yaml`). 🔍
* **GitHub Repos:** Multiple PoC scripts shared (e.g., Blackash-CVE-2025-8943).…

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Q7How to self-check? (Features/Scanning)

🔍 **Self-Check Steps**

**Check Version:** Is Flowise < 3.0.1? 📝
**Test Auth:** Try accessing `/api` without login. If it works, you're vulnerable! 🚨
**Scan:** Use Nuclei with the CVE-2025-8943 template. 🛠️

Q8Is it fixed officially? (Patch/Mitigation)

✅ **Official Fix Available**

* **Patch:** Upgrade to **Flowise 3.0.1** or later. 🆙
* **Mitigation:** Enable authentication and configure RBAC immediately if you can't upgrade. 🔐

Q9What if no patch? (Workaround)

🛡️ **No Patch? Workarounds**

**Enable Auth:** Force login for all users. 🔑
**Restrict Access:** Use Firewall/WAF to block external access to Flowise. 🧱
…

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Q10Is it urgent? (Priority Suggestion)

🔥 **Priority: CRITICAL (P0)**

* **CVSS:** 9.8 (Critical). 📊
* **Urgency:** Patch **IMMEDIATELY**. ⏳
* **Risk:** Active exploitation is likely due to public PoCs. 🚀

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