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

🩹 **Official Fix**: **Yes**. <br>🔗 **Reference**: GitHub Security Advisory **GHSA-r4v4-5mwr-2fwr**. <br>💡 **Action**: Upgrade to a patched version immediately.

Q: Is it urgent? (Priority Suggestion)

🚨 **Urgency**: **CRITICAL**. <br>📊 **CVSS**: High impact on Confidentiality, Integrity, and Availability. <br>⚡ **Priority**: **Immediate** patching required for all production systems using vulnerable versions.

Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: Thymeleaf template engine has a **Security Bypass** flaw in its expression execution mechanism.…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **Root Cause**: **CWE-917** (Improper Neutralization of Special Elements in Dynamic Code).
❌ **Flaw**: The engine fails to correctly restrict the scope of accessible objects during expression evaluation.

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Affected**: **Thymeleaf** (Java Template Engine).
📅 **Versions**: **3.1.3.RELEASE** and all earlier versions.
🏢 **Vendor**: thymeleaf.

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

💀 **Attacker Capabilities**:
1️⃣ **Execute Arbitrary Code** on the server.
2️⃣ **Read/Sensitive Data** (High Confidentiality).
3️⃣ **Modify System State** (High Integrity).…

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

🔓 **Exploitation Threshold**: **Low**.
✅ **Auth**: None required (**PR:N**).
✅ **Network**: Remote (**AV:N**).
✅ **UI**: No user interaction needed (**UI:N**).…

Question 6

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

Accepted Answer

📜 **Public Exploit**: **No** public PoC/Exploit listed in the data.
🔍 **Status**: References point to GitHub Security Advisory (**GHSA-r4v4-5mwr-2fwr**), but no active wild exploitation confirmed yet.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**:
1️⃣ Scan for **Thymeleaf** dependencies in Java projects.
2️⃣ Verify version is **< 3.1.3.RELEASE**.
3️⃣ Look for dynamic template rendering using user-controlled input.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🩹 **Official Fix**: **Yes**.
🔗 **Reference**: GitHub Security Advisory **GHSA-r4v4-5mwr-2fwr**.
💡 **Action**: Upgrade to a patched version immediately.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **No Patch Workaround**:
1️⃣ **Strict Input Validation**: Sanitize all user inputs before template processing.
2️⃣ **Disable Expressions**: Restrict or disable dynamic expression evaluation where possible.…

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🚨 **Urgency**: **CRITICAL**.
📊 **CVSS**: High impact on Confidentiality, Integrity, and Availability.
⚡ **Priority**: **Immediate** patching required for all production systems using vulnerable versions.

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-40477 — 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)

Continue exploring