CVE-2026-21509— Microsoft Office 安全漏洞
一分钟漏洞结论
影响对象
Microsoft Microsoft 365 Apps for Enterprise
利用判断
已确认在野利用，应立即处置
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Microsoft Office是美国微软（Microsoft）公司的一款办公软件套件产品。该产品常用组件包括Word、Excel、Access、Powerpoint、FrontPage等。 Microsoft Office存在安全漏洞，该漏洞源于安全决策依赖不可信输入，可能导致本地攻击者绕过安全功能。
已观察到在野利用
github_trending · low
cisa_kev · confirmed
可能的 ATT&CK 技术 1 AI
T1078 · Valid Accounts影响版本矩阵 5
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1< https://aka.ms/OfficeSecurityReleases |
affected |
| Microsoft | Microsoft Office 2016 | 16.0.0< 16.0.5539.1001 |
affected |
| Microsoft | Microsoft Office 2019 | 19.0.0< 16.0.10417.20095 |
affected |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1< https://aka.ms/OfficeSecurityReleases |
affected |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0< https://aka.ms/OfficeSecurityReleases |
affected |
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一、 漏洞 CVE-2026-21509 基础信息
漏洞信息
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Vulnerability Title
Microsoft Office Security Feature Bypass Vulnerability
来源: CVE Program / CVE List V5
Vulnerability Description
Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
在安全决策中依赖未经信任的输入
来源: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Microsoft Office是美国微软（Microsoft）公司的一款办公软件套件产品。该产品常用组件包括Word、Excel、Access、Powerpoint、FrontPage等。 Microsoft Office存在安全漏洞，该漏洞源于安全决策依赖不可信输入，可能导致本地攻击者绕过安全功能。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 ~ https://aka.ms/OfficeSecurityReleases | - |
|
| Microsoft | Microsoft Office 2016 | 16.0.0 ~ 16.0.5539.1001 | - |
|
| Microsoft | Microsoft Office 2019 | 19.0.0 ~ 16.0.10417.20095 | - |
|
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 ~ https://aka.ms/OfficeSecurityReleases | - |
|
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 ~ https://aka.ms/OfficeSecurityReleases | - |
|
二、漏洞 CVE-2026-21509 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|---|---|---|
| 1 | CVE-2026-21509 | https://github.com/kimstars/Ashwesker-CVE-2026-21509 | POC详情 |
| 2 | Educational PoC for CVE‑2026‑21509 (Microsoft Office security feature bypass). Generates a harmless DOCX with dummy OLE artifacts to study EDR/AV visibility. Not an exploit. For isolated labs only; see README for 7‑Zip inspection steps and mitigation references. | https://github.com/gavz/CVE-2026-21509-PoC | POC详情 |
| 3 | Powershell script with Detection and Remediation for CVE-2026-21509 | https://github.com/ksk-itdk/KSK-ITDK-CVE-2026-21509-Mitigation | POC详情 |
| 4 | New Physics Disclosure This repository contains a full weaponized exploit for **CVE-2026-21509**, targeting the Windows Network File System (NFSv4.1) kernel-mode driver (`nfssvr.sys`). | https://github.com/SimoesCTT/CTT-NFS-Vortex-RCE | POC详情 |
| 5 | Microsoft just released emergency patches for CVE-2026-21509, a zero-day in the Office Suite that bypasses OLE/COM mitigations when a user simply opens a file. They think their "Service-side change" for Office 2021+ is a solid wall. | https://github.com/SimoesCTT/SCTT-2026-33-0007-The-OLE-Vortex-Laminar-Bypass- | POC详情 |
| 6 | CVE-2026-21509 is a critical bypass in the Microsoft Office OLE (Object Linking and Embedding) validation engine. While standard "laminar" exploits attempt to manipulate static COM objects, this repository utilizes Theorem 4.2 to achieve a speculative race-condition bypass of the Object Definition Rule (ODR). | https://github.com/SimoesCTT/CTT-MICROSOFT-OFFICE-OLE-MANIFOLD-BYPASS-CVE-2026-21509 | POC详情 |
| 7 | YARA rule and python script to detect potential exploits for the CVE-2026-21509 vulnerability in MS Office | https://github.com/decalage2/detect_CVE-2026-21509 | POC详情 |
| 8 | None | https://github.com/kaizensecurity/CVE-2026-21509 | POC详情 |
| 9 | CVE-2026-21509 Mitigation | https://github.com/planetoid/cve-2026-21509-mitigation | POC详情 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-21509
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