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CVE-2026-34621 — AI Deep Analysis Summary

CVSS 8.6 ¡ High

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Adobe Acrobat Reader has a critical flaw in **object prototype property modification**. <br>💥 **Consequences**: Attackers can execute **arbitrary code** within the current user's environment.…

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-1321** (Prototype Pollution). <br>🔍 **Flaw**: Improper handling of object prototype properties allows attackers to inject malicious data into the JavaScript prototype chain.

Q3Who is affected? (Versions/Components)

📦 **Affected Versions**: <br>• Adobe Acrobat Reader **24.001.30356** <br>• Adobe Acrobat Reader **26.001.21367** <br>• **All versions prior** to these specific builds.

Q4What can hackers do? (Privileges/Data)

🕵️ **Attacker Capabilities**: <br>• Execute **arbitrary code** <br>• Gain **High** Confidentiality, Integrity, and Availability impact <br>• Operate with **Current User** privileges (no admin rights needed).

Q5Is exploitation threshold high? (Auth/Config)

⚠️ **Exploitation Threshold**: <br>• **Local** access required (AV:L) <br>• **Low** complexity (AC:L) <br>• **No** authentication needed (PR:N) <br>• **User Interaction** required (UI:R) - e.g., opening a malicious PDF.

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

🚫 **Public Exploit**: **No**. The `pocs` list is empty. <br>📉 **Risk**: While no public PoC exists yet, the low complexity and high impact make it a prime target for future wild exploitation.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: <br>1. Check your Acrobat Reader version. <br>2. Is it **24.001.30356** or **26.001.21367** or older? <br>3. If yes, you are **Vulnerable**. <br>4. Monitor Adobe Security Advisories for updates.

Q8Is it fixed officially? (Patch/Mitigation)

✅ **Official Fix**: **Yes**. <br>📅 **Published**: 2026-04-11. <br>🔗 **Reference**: [APSB26-43](https://helpx.adobe.com/security/products/acrobat/apsb26-43.html).…

Q9What if no patch? (Workaround)

🚧 **No Patch Workaround**: <br>• **Disable JavaScript** in Acrobat Reader preferences. <br>• **Avoid opening** untrusted PDF files. <br>• Use **Protected Mode** / Sandbox features if available.…

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **HIGH**. <br>📊 **CVSS Score**: High impact (C:H, I:H, A:H). <br>💡 **Priority**: Patch immediately.…