Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: Budibase has a critical **Authentication Bypass** vulnerability. The `authorized()` middleware fails to properly validate webhook paths.…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **Root Cause**: **CWE-74** (Improper Neutralization of Special Elements).
🔍 **Flaw**: The regex in the `authorized()` middleware is **unanchored**.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Affected**: **Budibase** (Low-code platform).
📅 **Versions**: **3.31.4 and earlier**.
🏢 **Vendor**: Budibase (UK-based open-source project).

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

🕵️ **Attacker Actions**:
1️⃣ Access **ANY** server-side API endpoint without credentials.
2️⃣ Read sensitive internal data (High Confidentiality impact).…

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

⚡ **Threshold**: **LOW**.
🔓 **Auth**: None required (PR:N).
🌐 **Network**: Remote (AV:N).
🖱️ **UI**: None required (UI:N).
🎯 **Complexity**: Low (AC:L). Just a crafted URL is enough.

Question 6

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

Accepted Answer

🔓 **Exploitation**: **YES**, Public PoCs exist.
🔗 **Sources**:
- Vulhub (Dockerized test env)
- Awesome-POC repo
- ProjectDiscovery Nuclei templates
🚀 **Status**: Easy to exploit with standard tools.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**:
1️⃣ Check your Budibase version (must be ≤ 3.31.4).
2️⃣ Use **Nuclei** with the CVE-2026-31816 template.…

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🩹 **Fix**: **YES**, officially patched.
📢 **Advisory**: GHSA-gw94-hprh-4wj8 on GitHub Security Advisories.
✅ **Action**: Upgrade to a version **newer than 3.31.4** immediately.

Question 9

What if no patch? (Workaround)

Accepted Answer

🛑 **No Patch Workaround**:
1️⃣ **WAF Rules**: Block query strings containing known webhook path patterns.
2️⃣ **Network**: Restrict access to Budibase API endpoints to trusted IPs only.…

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🚨 **Urgency**: **CRITICAL**.
📊 **CVSS**: High (C:H, I:H).
⏳ **Priority**: **Immediate Patching Required**. Since it allows full API bypass with zero authentication, this is a top-priority security incident.…

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CVE-2026-31816 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

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

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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