Jump to the main content block
  1. Home
  2. Information Security
  3. Vulnerability Alert

【Vulnerability Alert】Microsoft Excel Contains a High-Risk Security Vulnerability (CVE-2026-62870). Please Confirm and Apply Patches as Soon as Possible

publish date : 2026-08-07 update date : 2026-08-07

Source: Ministry of education information & communication security contingency platform

"" "" ""

Publication Number TACERT-ANA-2026080605083838 Publication Time 2026-08-06 17:28:39
Incident Type ANA-Vulnerability Alert Discovery Time 2026-08-06 17:28:39
Impact Level Middle  
[Subject]
【Vulnerability Alert】Microsoft Excel Contains a High-Risk Security Vulnerability (CVE-2026-62870). Please Confirm and Apply Patches as Soon as Possible
[Content]

Forwarded from the National Institute of Cyber Security Cybersecurity Alert NISAC-200-202608-00000002

Researchers discovered that Microsoft Excel contains a Use After Free vulnerability (CVE-2026-62870). An unauthenticated remote attacker may exploit this vulnerability to execute arbitrary code. Please confirm and apply patches as soon as possible.

Information Sharing Level: WHITE (the intelligence content is information that may be publicly disclosed)
[Affected Platform]

Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft Excel 2016 (32-bit edition) versions prior to 16.0.5561.1001 (exclusive)
Microsoft Excel 2016 (64-bit edition) versions prior to 16.0.5561.1001 (exclusive)
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Microsoft Office LTSC 2021 for 32-bit editions
Microsoft Office LTSC 2021 for 64-bit editions
Microsoft Office LTSC 2024 for 32-bit editions
Microsoft Office LTSC 2024 for 64-bit editions

[Recommended Actions]

The official vendor has released a remediation update for the vulnerability. Please refer to the official instructions for updating. The URL is as follows:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62870

[Reference]

1. https://nvd.nist.gov/vuln/detail/CVE-2026-62870
2. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62870
(This notification is for informational purposes only and does not constitute a cybersecurity incident).
If you have questions or suggestions regarding this notification, please feel free to contact us.
Ministry of education information & communication security contingency platform
Website: https://info.cert.tanet.edu.tw/
Phone: +886-7-5250211
Internet Phone: 98400000
E-Mail: service@cert.tanet.edu.tw
Organizer: Computer Center
Click Num:
Print