CVE-2026-44823

Name: CVE-2026-44823
Creator: NVD / NIST
Published: 2026-06-09T17:17:18.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.37%

Last modified Jun 19, 2026

CVE-2026-44823 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.37%

29.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Microsoft	365 Apps	All versions
Microsoft	Excel	2016
Microsoft	Microsoft 365	All versions
Microsoft	Office 2019	All versions
Microsoft	Office 2021	All versions
Microsoft	Office 2024	All versions
Microsoft	Office Online Server	All versions

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44823Vendor Advisory

Timeline

Published: Jun 9, 2026
Last Modified: Jun 19, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-44823?

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

How severe is CVE-2026-44823?

CVE-2026-44823 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2026-44823?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-44823?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST