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Vulnerabilities

Vulnerability · CVE-2026-21260

Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Published Feb 10, 2026 · catalog updated Aug 19, 2026 · Microsoft Microsoft Office 2019

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-21260. EPSS is 1.52%. Act only if a listed version of Microsoft Microsoft Office 2019 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.52%
Remediation
Version ranges on file
Affected products
cpe microsoft/365 apps · cpe microsoft/office · cpe microsoft/office long term servicing channel · cpe microsoft/sharepoint server · vendor Microsoft Microsoft Office 2019 19.0.0 <https://aka.ms/OfficeSecurityReleases

Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing 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/office2019
  • cpe microsoft/office long term servicing channel2021
  • cpe microsoft/sharepoint server< 16.0.19127.20518
  • vendor Microsoft Microsoft Office 2019 19.0.0 <https://aka.ms/OfficeSecurityReleases19.0.0 <https://aka.ms/OfficeSecurityReleases

How to fix CVE-2026-21260

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-2026-21260. EPSS is 1.52%. Act only if a listed version of Microsoft Microsoft Office 2019 is installed.

Which versions are affected?

Compare what you have installed with microsoft/office long term servicing channel 2021; microsoft/sharepoint server < 16.0.19127.20518; Microsoft Microsoft Office 2019 19.0.0 <https://aka.ms/OfficeSecurityReleases 19.0.0 <https://aka.ms/OfficeSecurityReleases. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 1.52%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Microsoft SharePoint security

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. Feb 10, 2026 · Monitored products — critical

    Detected

    Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

  3. Aug 19, 2026 · EUVD

    Updated

    Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Sources

  • EUVDVulnerability recordEUVD-2026-7354

    Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

    euvd.enisa.europa.eu
  • Monitored products — criticalVendor advisoryCVE-2026-21260

    Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • EUVDNov 2, 2026
  • Monitored products — criticalNov 2, 2026