Is CVE-2026-116927 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116927 being exploited in the wild.

How severe is CVE-2026-116927?

High severity, with a CVSS score of 8.8, published 10 November 2026.

Is there a fix for CVE-2026-116927?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-116927 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-116927?

Check whether you run Microsoft Excel. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-116927: Microsoft Excel heap-based buffer overflow

CVE-2026-116927 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Excel, a widely used spreadsheet application in business environments, contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code on a user's computer. An attacker can exploit this over a network by sending a malicious Excel file, potentially leading to complete system compromise including data theft, installation of malware, or ransomware.

Technologies: Microsoft Excel. Vendors: Microsoft.

Quick answers

Is CVE-2026-116927 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116927 being exploited in the wild.
How severe is CVE-2026-116927?: High severity, with a CVSS score of 8.8, published 10 November 2026.
Which products and versions are affected?: Microsoft Excel.
Is there a fix for CVE-2026-116927?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-116927 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-116927?: Check whether you run Microsoft Excel. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow in Microsoft Excel's parsing logic allows remote code execution when a user opens a specially crafted spreadsheet file. The vulnerability requires user interaction (opening a file) but can be delivered over the network. Successful exploitation grants the attacker arbitrary code execution in the context of the Excel process.

Affected products

Microsoft Excel

Timeline

2026-11-10: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-116927

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