CVE-2026-118723: Microsoft Excel untrusted pointer dereference code execution

CVE-2026-118723 · Severity: high · CVSS 7.8 · Published 2026-11-10

Microsoft Excel, a spreadsheet application used by businesses worldwide, contains a vulnerability where a malicious file can cause Excel to dereference an untrusted memory pointer. An attacker can exploit this by sending a specially crafted spreadsheet that executes arbitrary code on the victim's computer with the privileges of the user running Excel.

Technologies: Microsoft Excel. Vendors: Microsoft.

Quick answers

Is CVE-2026-118723 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-118723 being exploited in the wild.
How severe is CVE-2026-118723?
High severity, with a CVSS score of 7.8, published 10 November 2026.
Which products and versions are affected?
Microsoft Excel.
Is there a fix for CVE-2026-118723?
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-2026-118723 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-118723?
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

An untrusted pointer dereference flaw in Microsoft Excel allows arbitrary code execution through a maliciously crafted spreadsheet file. The vulnerability requires local execution and can be triggered when a user opens a crafted Excel document. Successful exploitation grants the attacker code execution in the context of the user running Excel.

Affected products

  • Microsoft Excel

Timeline

  • 2026-11-10: disclosed

References

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