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Vulnerabilities

Vulnerability · CVE-2026-40360

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Published May 12, 2026 · catalog updated Jun 17, 2026 · 365 apps

Check if you run it

No confirmed exploitation is on record for CVE-2026-40360. EPSS is 0.47%. Act only if a listed version of 365 apps is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
cpe microsoft/365 apps · cpe microsoft/excel · cpe microsoft/office · cpe microsoft/office long term servicing channel

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/365 appsversion unspecified
  • cpe microsoft/excel2016
  • cpe microsoft/office2019
  • cpe microsoft/office long term servicing channel2021

How to fix CVE-2026-40360

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40360. EPSS is 0.47%. Act only if a listed version of 365 apps is installed.

Which versions are affected?

Compare what you have installed with microsoft/office long term servicing channel 2021. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 12, 2026 · NIST NVD

    Detected

    Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Sources

  • CVE.orgVulnerability recordCVE-2026-40360

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40360

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40360

    Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.