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

The Microsoft Outlook application installed on the remote host is missing a security update. It is, therefore, affected by the following vulnerability:

  - An information disclosure vulnerability. An attacker can     exploit this to disclose potentially sensitive     information. (CVE-2026-21260)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Microsoft SharePoint Server 2016 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - A session spoofing vulnerability exists. An attacker can     exploit this to perform actions with the privileges of     another user. (CVE-2026-21511, CVE-2026-21260)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft Word Products are missing a security update. They are, therefore, affected by multiple spoofing vulnerabilities:

  - Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing     over a network. (CVE-2026-21511)

  - A spoofing vulnerability in Microsoft Office Word allows an unauthorized attacker to perform spoofing over a     network. (CVE-2026-21260)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Microsoft SharePoint Server Subscription Edition installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - A session spoofing vulnerability exists. An attacker can     exploit this to perform actions with the privileges of     another user. (CVE-2026-21511, CVE-2026-21260)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - A remote code execution vulnerability. An attacker can     exploit this to bypass authentication and execute     unauthorized arbitrary commands. (CVE-2026-21260,     CVE-2026-62551, CVE-2026-62563)

  - A session spoofing vulnerability exists. An attacker can     exploit this to perform actions with the privileges of     another user. (CVE-2026-21511, CVE-2026-21260)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
298974	Security Updates for Outlook (February 2026)	Nessus	Windows	Local	high
298565	Security Updates for Microsoft SharePoint Server 2016 (February 2026)	Nessus	Windows : Microsoft Bulletins	Local	high
298560	Security Updates for Microsoft Word Products (February 2026)	Nessus	Windows : Microsoft Bulletins	Local	high
298559	Security Updates for Microsoft SharePoint Server Subscription Edition (February 2026)	Nessus	Windows : Microsoft Bulletins	Local	high
298550	Security Updates for Microsoft SharePoint Server 2019 (February 2026)	Nessus	Windows : Microsoft Bulletins	Local	high

Detections

Analytics

CVE-2026-21260

high

Tenable Plugins

high

high

high

high

high