Vulnerability Description
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
CVSS Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | 365 Apps | - |
| Microsoft | Office | 2019 |
| Microsoft | Office Long Term Servicing Channel | 2021 |
| Microsoft | Outlook | 2016 |
| Microsoft | Sharepoint Server | < 16.0.19127.20518 |
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-21260?
CVE-2026-21260 is a vulnerability with a CVSS score of 7.5 (HIGH). Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
How severe is CVE-2026-21260?
CVE-2026-21260 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-21260?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft 365 Apps, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Outlook, Microsoft Sharepoint Server.