CVE-2026-21260
Microsoft Outlook Spoofing Vulnerability
HIGH 7.5
At a glance
- Source
- NVD
- EPSS
- EPSS 1.52 % · percentile 75 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Weaknesses (CWE)
- CWE-200 — Exposure of Sensitive Information to an Unauthorized Actor
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | NVD · secure@microsoft.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-7354
- GCVE · GCVE-0-2026-21260
CERT-FR advisories
- CERTFR-2026-AVI-0153 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0149 — Multiples vulnérabilités dans Microsoft Office · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x64:*cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x86:*cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*< 16.0.19127.20518cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Microsoft · Microsoft 365 Apps for Enterprise | affected 16.0.1 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office 2019 | affected 19.0.0 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office LTSC 2021 | affected 16.0.1 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office LTSC 2024 | affected 16.0.0 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Outlook 2016 | affected 16.0.0.0 < 16.0.5539.1002 |
| Microsoft · Microsoft SharePoint Enterprise Server 2016 | affected 16.0.0 < 16.0.5539.1002 |
| Microsoft · Microsoft SharePoint Server 2019 | affected 16.0.0 < 16.0.10417.20097 |
| Microsoft · Microsoft SharePoint Server Subscription Edition | affected 16.0.0 < 16.0.19127.20518 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |