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No exploitation reportedFix available

CVE-2026-21260

No exploitation reported by the sources we read.

  • Published2026-02-10
  • Fixed in16.0.19127.20518
  • WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2026-02-1018:16CVE publishedNVD

Versions per branch

NVD
Microsoft sharepoint server
BranchAffectedFixed in
16.0< 16.0.19127.2051816.0.19127.20518
2016.x= 2016no fix published
2019.x= 2019no fix published
Microsoft office long term servicing channel
BranchAffectedFixed in
2021.x= 2021no fix published
2024.x= 2024no fix published
Microsoft 365 apps
BranchAffectedFixed in
—all versionsno fix published

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA8 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft 365 Apps for Enterprise

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.1, < https://aka.ms/OfficeSecurityReleasesfixed in https://aka.ms/OfficeSecurityReleasescustom
  • Microsoft Office 2019

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 19.0.0, < https://aka.ms/OfficeSecurityReleasesfixed in https://aka.ms/OfficeSecurityReleasescustom
  • Microsoft Office LTSC 2021

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.1, < https://aka.ms/OfficeSecurityReleasesfixed in https://aka.ms/OfficeSecurityReleasescustom
  • Microsoft Office LTSC 2024

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.0, < https://aka.ms/OfficeSecurityReleasesfixed in https://aka.ms/OfficeSecurityReleasescustom
  • Microsoft Outlook 2016

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.0.0, < 16.0.5539.1002fixed in 16.0.5539.1002custom
  • Microsoft SharePoint Enterprise Server 2016

    platforms: x64-based Systems

    Affected
    • ≥ 16.0.0, < 16.0.5539.1002fixed in 16.0.5539.1002custom

2 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-19

Fix

  1. Update Microsoft sharepoint server to 16.0.19127.20518

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2026-02-10
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-2pm9-6ww9-wqv9

Frequently asked questions

What is 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.

Is CVE-2026-21260 actively exploited?

Active exploitation of CVE-2026-21260 has not been confirmed. Its EPSS score was 1.5% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-21260?

CVE-2026-21260 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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