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CVE-2026-45455— Microsoft Excel Information Disclosure Vulnerability

CVSS 3.3 · Low EPSS 0.49% · P38

Possible ATT&CK Techniques 1AI

T1213 · Data from Information Repositories

Affected Version Matrix 9

VendorProductVersion RangeStatus
MicrosoftMicrosoft 365 Apps for Enterprise16.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Excel 201616.0.0.0< 16.0.5556.1001affected
MicrosoftMicrosoft Office 201919.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 365 for Mac-affected
MicrosoftMicrosoft Office LTSC 202116.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office LTSC 202416.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office LTSC for Mac 2021-affected
MicrosoftMicrosoft Office LTSC for Mac 2024-affected
MicrosoftOffice Online Server16.0.0.0< 16.0.10417.20137affected
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I. Basic Information for CVE-2026-45455

Vulnerability Information
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Vulnerability Title
Microsoft Excel Information Disclosure Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Office Excel 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office Excel是美国微软（Microsoft）开源的一款电子表格软件。 Microsoft Office Excel存在缓冲区错误漏洞。攻击者利用该漏洞可以获取敏感信息。以下产品和版本受到影响：Office Online Server,Microsoft Office 2019 for 32-bit editions,Microsoft Office 2019 for 64-bit editions,Microsoft 365 Apps for Enterprise for
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

VendorProductAffected VersionsCPESubscribe
MicrosoftMicrosoft 365 Apps for Enterprise 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Excel 2016 16.0.0.0 ~ 16.0.5556.1001 -
MicrosoftMicrosoft Office 2019 19.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office 365 for Mac 1.0.0 ~ 16.110.26061317 -
MicrosoftMicrosoft Office LTSC 2021 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC 2024 16.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC for Mac 2021 16.0.1 ~ 16.110.26061317 -
MicrosoftMicrosoft Office LTSC for Mac 2024 16.0.0 ~ 16.110.26061317 -
MicrosoftOffice Online Server 16.0.0.0 ~ 16.0.10417.20137 -

II. Public POCs for CVE-2026-45455

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III. Intelligence Information for CVE-2026-45455

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Vendor Advisories for CVE-2026-45455 (1)

Same Patch Batch · Microsoft · 2026-06-09 · 200 CVEs total

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Showing top 20 of 200 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft
Same weakness: CWE-125

V. Comments for CVE-2026-45455

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