Microsoft Office Word stack-based overflow

Summaryinfo

A vulnerability, which was classified as problematic, was found in Microsoft Office. This affects an unknown part of the component Word. The manipulation results in stack-based overflow. This vulnerability was named CVE-2026-63527. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Microsoft Office (affected version not known). It has been classified as problematic. Affected is some unknown functionality of the component Word. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

The advisory is available at msrc.microsoft.com. This vulnerability is traded as CVE-2026-63527 since 07/17/2026. The exploitability is told to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/12/2026).

The vulnerability scanner Nessus provides a plugin with the ID 334624 (Security Updates for Microsoft Word Products (August 2026)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (334624). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Office Suite Software

Vendor

• Microsoft

Name

• Office

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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