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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: A Code Injection flaw in Microsoft Semantic Kernel's `InMemoryVectorStore` filter. 💥 **Consequences**: Allows Remote Code Execution (RCE).…
🛡️ **Root Cause**: CWE-94 (Code Injection). The vulnerability stems from a defect in how the `InMemoryVectorStore` handles filtering logic, failing to sanitize inputs properly before execution.
Q3Who is affected? (Versions/Components)
📦 **Affected**: Microsoft Semantic Kernel. Specifically, versions **prior to 1.39.4**. If you are running any version < 1.39.4, you are at risk.
Q4What can hackers do? (Privileges/Data)
💀 **Attacker Capabilities**: Full Remote Code Execution. With CVSS score indicating High impact on Confidentiality, Integrity, and Availability, hackers can execute arbitrary commands, steal data, or destroy systems.
Q5Is exploitation threshold high? (Auth/Config)
🔓 **Exploitation Threshold**: Low. CVSS Vector `AV:N/AC:L/UI:N` means it is Network-accessible, Low Complexity, and requires **No User Interaction**. However, it requires `PR:L` (Low Privileges) to exploit.
Q6Is there a public Exp? (PoC/Wild Exploitation)
💣 **Public Exploit**: YES. A PoC is available on GitHub: `CVE-2026-26030-Microsoft-Semantic-Kernel-1.39.4-RCE`. Wild exploitation is possible given the public PoC.
Q7How to self-check? (Features/Scanning)
🔍 **Self-Check**: Scan for Microsoft Semantic Kernel usage in your codebase. Check if `InMemoryVectorStore` is used with user-controllable filter inputs. Verify your installed version number immediately.
Q8Is it fixed officially? (Patch/Mitigation)
✅ **Official Fix**: YES. Patched in **Semantic Kernel 1.39.4**. Refer to the official release notes and GitHub PR #13505 for the specific code changes.
Q9What if no patch? (Workaround)
🚧 **No Patch?**: If you cannot upgrade immediately, strictly sanitize all inputs passed to `InMemoryVectorStore` filters. Avoid using `InMemoryVectorStore` with untrusted data.…
🔥 **Urgency**: CRITICAL. Due to RCE capability, public PoC, and low exploitation barrier, this requires **immediate patching** to version 1.39.4 or higher. Do not delay.