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Multiple Remote Code Execution Vulnerabilities in Microsoft Excel 

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Microsoft Office

Overview

Multiple vulnerabilities have been reported in Microsoft Office Excel which could allow an attacker to execute arbitrary code on the affected system.

 

Target Audience:

All end-user organizations and individuals managing Microsoft Excel.

Risk Assessment:

High risk of remote code execution and system compromise.

Impact Assessment:

Potential for unauthorized access, data theft, or execution of malicious code.

Description

Microsoft Excel is a spreadsheet application which allows users to organize, analyze, and visualize data using formulas, charts, and pivot tables. It is used for tasks ranging from simple calculations to complex financial and statistical modeling.

These vulnerabilities exist in Microsoft Excel due to memory handling flaws. A remote attacker could exploit these vulnerabilities by enticing the target user to execute a specially crafted Excel file. Successful exploitation of these vulnerabilities could allow the attacker to execute arbitrary code resulting in system compromise, or data theft.

Solution

Apply appropriate security updates as mentioned in

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20955

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20957

Vendor Information

Microsoft

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20955

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20957

References

 

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20955

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20957

CVE Name

CVE-2026-20955

CVE-2026-20957

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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