CVE-2026-21521— Word Copilot Information Disclosure Vulnerability
Possible ATT&CK Techniques 1AI
T1561 · Disk WipeAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Microsoft 365 Word Copilot | - | affected |
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I. Basic Information for CVE-2026-21521
Vulnerability Information
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Vulnerability Title
Word Copilot Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
转义、元或控制序列转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft 365 Word Copilot 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft 365 Word Copilot是美国Microsoft公司的一个AI助手。 Microsoft 365 Word Copilot存在安全漏洞，该漏洞源于转义序列、元序列或控制序列处理不当。攻击者利用该漏洞可以通过网络泄露信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Microsoft 365 Word Copilot | - | - |
II. Public POCs for CVE-2026-21521
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Microsoft · 2026-01-22 · 8 CVEs total
| CVE-2026-24306 | 9.8 CRITICAL | Azure Front Door Elevation of Privilege Vulnerability |
| CVE-2026-21264 | 9.3 CRITICAL | Microsoft Account Spoofing Vulnerability |
| CVE-2026-24307 | 9.3 CRITICAL | M365 Copilot Information Disclosure Vulnerability |
| CVE-2026-24305 | 9.3 CRITICAL | Azure Entra ID Elevation of Privilege Vulnerability |
| CVE-2026-21227 | 8.2 HIGH | Azure Logic Apps Elevation of Privilege Vulnerability |
| CVE-2026-21520 | 7.5 HIGH | Copilot Studio Information Disclosure Vulnerability |
| CVE-2026-21524 | 7.4 HIGH | Azure Data Explorer Information Disclosure Vulnerability |
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