CVE-2026

We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to provide you the services will be used. You may change your selection by clicking “Manage Cookies” at the bottom of the page. Privacy Statement Third-Party Cookies

Released: Jul 14, 2026

Last updated: Sep 15, 2026

Please see Common Vulnerability Scoring System for more information on the definition of these metrics.

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

The following table provides an exploitability assessment for this vulnerability at the time of original publication.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?

An attacker must send a user a malicious Office file and convince them to open it.

According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?

The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. This means an attacker or victim needs to execute code from the local machine to exploit the vulnerability.

Is the Preview Pane an attack vector for this vulnerability?

No, the Preview Pane is not an attack vector.

with KAIST Hacking Lab

0ccbbf129444eb66344ccafb92b00df4

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle .

Updated an acknowledgement. This is an informational change only.

Information published.