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Vulnerabilities

Vulnerability · CVE-2026-100208

Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Published Sep 25, 2026 · catalog updated Oct 20, 2026 · 365 apps

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-100208. EPSS is 0.45%. 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.

Same product and reporting

Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.45%
Remediation
Advisory link
Affected products
cpe microsoft/365 apps · cpe microsoft/office 2021 · cpe microsoft/office 2024

Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

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/office 2021version unspecified
  • cpe microsoft/office 2024version unspecified

How to fix CVE-2026-100208

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

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-2026-100208. EPSS is 0.45%. Act only if a listed version of 365 apps is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow. EPSS 0.45%. 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. Sep 25, 2026 · NIST NVD

    Detected

    Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

  2. Oct 20, 2026 · NIST NVD

    Updated

    Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-100208

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-100208

    30-day exploitation probability 0.45%

    first.org
  • NIST NVDVulnerability recordCVE-2026-100208

    Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 25, 2026
  • CVE.orgOct 21, 2026
  • NIST NVDOct 21, 2026