Skip to content
Fencer Intel
medium 6.6

CVE-2026-124229 json

Microsoft Office Excel Remote Code Execution Vulnerability

published yesterday modified 16h ago also EUVD-2026-122272

cvss
6.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

Deserialization of untrusted data in Microsoft Office Excel allows an unauthorized attacker to execute code with a physical attack.

Patch / fix

  • Microsoft Microsoft Office 365 for Mac 16.115.26110837
  • Microsoft Microsoft Office LTSC 2021 16.0.14334.21048
  • Microsoft Microsoft Office LTSC 2024 16.0.17932.21140
  • Microsoft Microsoft Office LTSC for Mac 2021 16.115.26110837
  • Microsoft Microsoft Office LTSC for Mac 2024 16.115.26110837

Is CVE-2026-124229 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
yesterday

Exploit prediction

1.90% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 6.6 CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 6.6 CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Microsoft 365 Apps for Enterprise
  • 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

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel 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.