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CVE-2026-33825
CISA KEV
high
[KEV] Vulnerability in Microsoft defender (CVE-2026-33825)
Summary
vulnerability in Microsoft defender (CVE-2026-33825). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.
AI summary openai / gpt-4o
A critical security issue has been identified in Microsoft Defender. This vulnerability might allow unauthorized employees to gain administrative privileges and access sensitive information. A similar issue was seen in past corporate network takeovers. It is advised to quickly apply the security update to protect the system.
In Microsoft Defender, a vulnerability related to insufficient granularity of access control allows an authorized attacker to escalate privileges locally, potentially threatening the system's security. Specific affected version ranges, paths, or function names are not certain from the material; however, it is recommended to apply patches issued by Microsoft promptly.
❓ What is the problem
A vulnerability in Microsoft Defender related to insufficient granularity of access control.
📍 Affected scope
Specific affected functions, endpoints, or parameters are not identified.
🔥 Severity
High
🔧 How to fix
Apply the patch released by Microsoft.
🛡️ Workaround
Not specified in the data provided.
🔍 Detection
Not specified in the data provided.
Related past incidents Similar incidents extracted from past CVEs
Similar privilege escalation issue affecting Windows.
If this happens at your company Expected impact per business scenario
📌 Corporate networks using Microsoft Defender for endpoint security.
Potential unauthorized privilege escalation compromising sensitive data.
📌 Small businesses relying on default Microsoft Defender settings.
Risk of insider threats exploiting elevated privileges.
📌 Enterprises without timely updates to security patches.
Higher likelihood of undetected privilege escalation incidents.
Recommended action
Ensure immediate application of patches released by Microsoft to secure the system.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'defender' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `defender` を grep し、稼働しているサービス・バージョンを把握する。
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4Consider incident declaration escalate
Notify SOC / on-callCISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory NVD