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Fencer Vulns
high 7.0

CVE-2026-44818 json

Microsoft Excel Remote Code Execution Vulnerability

published 2026-06-09 5 mo ago modified 2026-09-24 45 d ago also EUVD-2026-35661

cvss
7.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Patch / fix

  • Microsoft Microsoft Excel 2016 16.0.5556.1001
  • Microsoft Microsoft Office 365 for Mac 16.110.26061317
  • Microsoft Microsoft Office LTSC for Mac 2021 16.110.26061317
  • Microsoft Microsoft Office LTSC for Mac 2024 16.110.26061317
  • Microsoft Office Online Server 16.0.10417.20137

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Microsoft 365 Apps for Enterprise
  • Microsoft Microsoft Excel 2016
  • Microsoft Microsoft Office 2019
  • Microsoft Microsoft Office 365 for Mac
  • Microsoft Microsoft Office LTSC 2021
  • Microsoft Microsoft Office LTSC 2024
  • Microsoft Microsoft Office LTSC for Mac 2021
  • Microsoft Microsoft Office LTSC for Mac 2024
  • Microsoft Office Online Server

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.