Vulnerability-Lookup

WID-SEC-W-2026-0371

Vulnerability from csaf_certbund - Published: 2026-02-10 23:00 - Updated: 2026-02-10 23:00

Summary

Microsoft Office: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Excel ist ein Tabellenkalkulationsprogramm der Microsoft Office Suite und ist sowohl für Microsoft Windows als auch für Mac OS verfügbar. Microsoft Word ist ein Textverarbeitungsprogramm der Firma Microsoft für die Windows-Betriebssysteme und Mac OS. Outlook ist ein Personal Information Manager von Microsoft und ist Bestandteil der Office Suite. Microsoft Office Online Server ist ein Serverprodukt, das browserbasierte Versionen von Word, PowerPoint, Excel und OneNote bereitstellt. Microsoft Sharepoint Services ist ein Portalsystem für die zentrale Verwaltung von Dokumenten und Anwendungen. Die Inhalte werden u.a. über Webseiten zur Verfügung gestellt. Die Microsoft Office Suite beinhaltet zahlreiche Büroanwendungen wie Textverarbeitung, Tabellenkalkulation, Datenbank und weitere Applikationen. Microsoft Sharepoint ist ein Portalsystem für die zentrale Verwaltung von Dokumenten und Anwendungen. Die Inhalte werden u. a. über Webseiten zur Verfügung gestellt. Microsoft 365 Apps ist eine Office Suite für zahlreiche Büroanwendungen.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Microsoft Excel, Microsoft Word, Microsoft Outlook, Microsoft Office Online Server, Microsoft SharePoint, Microsoft Office, Microsoft SharePoint Server 2019 und Microsoft 365 Apps ausnutzen, um Administratorrechte zu erlangen, Spoofing-Angriffe durchzuführen, Sicherheitsmaßnahmen zu umgehen und vertrauliche Informationen offenzulegen.

Betroffene Betriebssysteme: - Windows

CVE-2026-21258

Affected products

Known affected 13 products

Product	Identifier	Version
Microsoft SharePoint Server 2019 Microsoft	`cpe:/a:microsoft:sharepoint_server_2019:-`	—
Microsoft Office 2019 Microsoft / Office	`cpe:/a:microsoft:office:2019`	2019
Microsoft Office LTSC for Mac 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2021`	LTSC for Mac 2021
Microsoft 365 Apps Microsoft	`cpe:/a:microsoft:365_apps:-`	—
Microsoft SharePoint Enterprise Server 2016 Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:enterprise_server_2016`	Enterprise Server 2016
Microsoft Office Online Server Microsoft	`cpe:/a:microsoft:office_online_server:-`	—
Microsoft Outlook 2016 Microsoft / Outlook	`cpe:/a:microsoft:outlook:2016`	2016
Microsoft SharePoint Server Subscription Edition Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:server_subscription_edition`	Server Subscription Edition
Microsoft Office LTSC 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2021`	LTSC 2021
Microsoft Word 2016 Microsoft / Word	`cpe:/a:microsoft:word:2016`	2016
Microsoft Office LTSC for Mac 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2024`	LTSC for Mac 2024
Microsoft Excel 2016 Microsoft / Excel	`cpe:/a:microsoft:excel:2016`	2016
Microsoft Office LTSC 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2024`	LTSC 2024

CVE-2026-21259

Affected products

Known affected 13 products

Product	Identifier	Version
Microsoft SharePoint Server 2019 Microsoft	`cpe:/a:microsoft:sharepoint_server_2019:-`	—
Microsoft Office 2019 Microsoft / Office	`cpe:/a:microsoft:office:2019`	2019
Microsoft Office LTSC for Mac 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2021`	LTSC for Mac 2021
Microsoft 365 Apps Microsoft	`cpe:/a:microsoft:365_apps:-`	—
Microsoft SharePoint Enterprise Server 2016 Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:enterprise_server_2016`	Enterprise Server 2016
Microsoft Office Online Server Microsoft	`cpe:/a:microsoft:office_online_server:-`	—
Microsoft Outlook 2016 Microsoft / Outlook	`cpe:/a:microsoft:outlook:2016`	2016
Microsoft SharePoint Server Subscription Edition Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:server_subscription_edition`	Server Subscription Edition
Microsoft Office LTSC 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2021`	LTSC 2021
Microsoft Word 2016 Microsoft / Word	`cpe:/a:microsoft:word:2016`	2016
Microsoft Office LTSC for Mac 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2024`	LTSC for Mac 2024
Microsoft Excel 2016 Microsoft / Excel	`cpe:/a:microsoft:excel:2016`	2016
Microsoft Office LTSC 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2024`	LTSC 2024

CVE-2026-21260

Affected products

Known affected 13 products

Product	Identifier	Version
Microsoft SharePoint Server 2019 Microsoft	`cpe:/a:microsoft:sharepoint_server_2019:-`	—
Microsoft Office 2019 Microsoft / Office	`cpe:/a:microsoft:office:2019`	2019
Microsoft Office LTSC for Mac 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2021`	LTSC for Mac 2021
Microsoft 365 Apps Microsoft	`cpe:/a:microsoft:365_apps:-`	—
Microsoft SharePoint Enterprise Server 2016 Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:enterprise_server_2016`	Enterprise Server 2016
Microsoft Office Online Server Microsoft	`cpe:/a:microsoft:office_online_server:-`	—
Microsoft Outlook 2016 Microsoft / Outlook	`cpe:/a:microsoft:outlook:2016`	2016
Microsoft SharePoint Server Subscription Edition Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:server_subscription_edition`	Server Subscription Edition
Microsoft Office LTSC 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2021`	LTSC 2021
Microsoft Word 2016 Microsoft / Word	`cpe:/a:microsoft:word:2016`	2016
Microsoft Office LTSC for Mac 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2024`	LTSC for Mac 2024
Microsoft Excel 2016 Microsoft / Excel	`cpe:/a:microsoft:excel:2016`	2016
Microsoft Office LTSC 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2024`	LTSC 2024

CVE-2026-21261

Affected products

Known affected 13 products

Product	Identifier	Version
Microsoft SharePoint Server 2019 Microsoft	`cpe:/a:microsoft:sharepoint_server_2019:-`	—
Microsoft Office 2019 Microsoft / Office	`cpe:/a:microsoft:office:2019`	2019
Microsoft Office LTSC for Mac 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2021`	LTSC for Mac 2021
Microsoft 365 Apps Microsoft	`cpe:/a:microsoft:365_apps:-`	—
Microsoft SharePoint Enterprise Server 2016 Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:enterprise_server_2016`	Enterprise Server 2016
Microsoft Office Online Server Microsoft	`cpe:/a:microsoft:office_online_server:-`	—
Microsoft Outlook 2016 Microsoft / Outlook	`cpe:/a:microsoft:outlook:2016`	2016
Microsoft SharePoint Server Subscription Edition Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:server_subscription_edition`	Server Subscription Edition
Microsoft Office LTSC 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2021`	LTSC 2021
Microsoft Word 2016 Microsoft / Word	`cpe:/a:microsoft:word:2016`	2016
Microsoft Office LTSC for Mac 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2024`	LTSC for Mac 2024
Microsoft Excel 2016 Microsoft / Excel	`cpe:/a:microsoft:excel:2016`	2016
Microsoft Office LTSC 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2024`	LTSC 2024

CVE-2026-21511

Affected products

Known affected 13 products

Product	Identifier	Version
Microsoft SharePoint Server 2019 Microsoft	`cpe:/a:microsoft:sharepoint_server_2019:-`	—
Microsoft Office 2019 Microsoft / Office	`cpe:/a:microsoft:office:2019`	2019
Microsoft Office LTSC for Mac 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2021`	LTSC for Mac 2021
Microsoft 365 Apps Microsoft	`cpe:/a:microsoft:365_apps:-`	—
Microsoft SharePoint Enterprise Server 2016 Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:enterprise_server_2016`	Enterprise Server 2016
Microsoft Office Online Server Microsoft	`cpe:/a:microsoft:office_online_server:-`	—
Microsoft Outlook 2016 Microsoft / Outlook	`cpe:/a:microsoft:outlook:2016`	2016
Microsoft SharePoint Server Subscription Edition Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:server_subscription_edition`	Server Subscription Edition
Microsoft Office LTSC 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2021`	LTSC 2021
Microsoft Word 2016 Microsoft / Word	`cpe:/a:microsoft:word:2016`	2016
Microsoft Office LTSC for Mac 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2024`	LTSC for Mac 2024
Microsoft Excel 2016 Microsoft / Excel	`cpe:/a:microsoft:excel:2016`	2016
Microsoft Office LTSC 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2024`	LTSC 2024

CVE-2026-21514

Affected products

Known affected 13 products

Product	Identifier	Version
Microsoft SharePoint Server 2019 Microsoft	`cpe:/a:microsoft:sharepoint_server_2019:-`	—
Microsoft Office 2019 Microsoft / Office	`cpe:/a:microsoft:office:2019`	2019
Microsoft Office LTSC for Mac 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2021`	LTSC for Mac 2021
Microsoft 365 Apps Microsoft	`cpe:/a:microsoft:365_apps:-`	—
Microsoft SharePoint Enterprise Server 2016 Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:enterprise_server_2016`	Enterprise Server 2016
Microsoft Office Online Server Microsoft	`cpe:/a:microsoft:office_online_server:-`	—
Microsoft Outlook 2016 Microsoft / Outlook	`cpe:/a:microsoft:outlook:2016`	2016
Microsoft SharePoint Server Subscription Edition Microsoft / SharePoint	`cpe:/a:microsoft:sharepoint:server_subscription_edition`	Server Subscription Edition
Microsoft Office LTSC 2021 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2021`	LTSC 2021
Microsoft Word 2016 Microsoft / Word	`cpe:/a:microsoft:word:2016`	2016
Microsoft Office LTSC for Mac 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_for_mac_2024`	LTSC for Mac 2024
Microsoft Excel 2016 Microsoft / Excel	`cpe:/a:microsoft:excel:2016`	2016
Microsoft Office LTSC 2024 Microsoft / Office	`cpe:/a:microsoft:office:ltsc_2024`	LTSC 2024

References

3 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://msrc.microsoft.com/update-guide/	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
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    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Excel ist ein Tabellenkalkulationsprogramm der Microsoft Office Suite und ist sowohl f\u00fcr Microsoft Windows als auch f\u00fcr Mac OS verf\u00fcgbar.\r\nMicrosoft Word ist ein Textverarbeitungsprogramm der Firma Microsoft f\u00fcr die Windows-Betriebssysteme und Mac OS.\r\nOutlook ist ein Personal Information Manager von Microsoft und ist Bestandteil der Office Suite.\r\nMicrosoft Office Online Server ist ein Serverprodukt, das browserbasierte Versionen von Word, PowerPoint, Excel und OneNote bereitstellt. \r\nMicrosoft Sharepoint Services ist ein Portalsystem f\u00fcr die zentrale Verwaltung von Dokumenten und Anwendungen. Die Inhalte werden u.a. \u00fcber Webseiten zur Verf\u00fcgung gestellt.\r\nDie Microsoft Office Suite beinhaltet zahlreiche B\u00fcroanwendungen wie Textverarbeitung, Tabellenkalkulation, Datenbank und weitere Applikationen.\r\nMicrosoft Sharepoint ist ein Portalsystem f\u00fcr die zentrale Verwaltung von Dokumenten und Anwendungen. Die Inhalte werden u. a. \u00fcber Webseiten zur Verf\u00fcgung gestellt.\r\nMicrosoft 365 Apps ist eine Office Suite f\u00fcr zahlreiche B\u00fcroanwendungen.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Microsoft Excel, Microsoft Word, Microsoft Outlook, Microsoft Office Online Server, Microsoft SharePoint, Microsoft Office, Microsoft SharePoint Server 2019 und Microsoft 365 Apps ausnutzen, um Administratorrechte zu erlangen, Spoofing-Angriffe durchzuf\u00fchren, Sicherheitsma\u00dfnahmen zu umgehen und vertrauliche Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
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      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
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    "references": [
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        "category": "self",
        "summary": "WID-SEC-W-2026-0371 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0371.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-0371 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0371"
      },
      {
        "category": "external",
        "summary": "Microsoft Leitfaden f\u00fcr Sicherheitsupdates",
        "url": "https://msrc.microsoft.com/update-guide/"
      }
    ],
    "source_lang": "en-US",
    "title": "Microsoft Office: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-02-10T23:00:00.000+00:00",
      "generator": {
        "date": "2026-02-11T09:42:32.084+00:00",
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      "revision_history": [
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          "number": "1",
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      "status": "final",
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              "product_identification_helper": {
                "cpe": "cpe:/a:microsoft:office_online_server:-"
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          },
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                  }
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            "name": "Outlook"
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                  "product_identification_helper": {
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                }
              },
              {
                "category": "product_version",
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          {
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                  }
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              }
            ],
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            "name": "Word"
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        ],
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        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
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      "cve": "CVE-2026-21258",
      "product_status": {
        "known_affected": [
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          "T050751",
          "T050754",
          "T050753",
          "T050750",
          "T050749",
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      "release_date": "2026-02-10T23:00:00.000+00:00",
      "title": "CVE-2026-21258"
    },
    {
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      "product_status": {
        "known_affected": [
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          "T050754",
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          "T050750",
          "T050749",
          "T050748",
          "T050756",
          "T050755",
          "T050747",
          "T050758",
          "T050746",
          "T050757"
        ]
      },
      "release_date": "2026-02-10T23:00:00.000+00:00",
      "title": "CVE-2026-21259"
    },
    {
      "cve": "CVE-2026-21260",
      "product_status": {
        "known_affected": [
          "T050752",
          "T050751",
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          "T050753",
          "T050750",
          "T050749",
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          "T050756",
          "T050755",
          "T050747",
          "T050758",
          "T050746",
          "T050757"
        ]
      },
      "release_date": "2026-02-10T23:00:00.000+00:00",
      "title": "CVE-2026-21260"
    },
    {
      "cve": "CVE-2026-21261",
      "product_status": {
        "known_affected": [
          "T050752",
          "T050751",
          "T050754",
          "T050753",
          "T050750",
          "T050749",
          "T050748",
          "T050756",
          "T050755",
          "T050747",
          "T050758",
          "T050746",
          "T050757"
        ]
      },
      "release_date": "2026-02-10T23:00:00.000+00:00",
      "title": "CVE-2026-21261"
    },
    {
      "cve": "CVE-2026-21511",
      "product_status": {
        "known_affected": [
          "T050752",
          "T050751",
          "T050754",
          "T050753",
          "T050750",
          "T050749",
          "T050748",
          "T050756",
          "T050755",
          "T050747",
          "T050758",
          "T050746",
          "T050757"
        ]
      },
      "release_date": "2026-02-10T23:00:00.000+00:00",
      "title": "CVE-2026-21511"
    },
    {
      "cve": "CVE-2026-21514",
      "product_status": {
        "known_affected": [
          "T050752",
          "T050751",
          "T050754",
          "T050753",
          "T050750",
          "T050749",
          "T050748",
          "T050756",
          "T050755",
          "T050747",
          "T050758",
          "T050746",
          "T050757"
        ]
      },
      "release_date": "2026-02-10T23:00:00.000+00:00",
      "title": "CVE-2026-21514"
    }
  ]
}

CVE-2026-21258 (GCVE-0-2026-21258)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25

Title

Microsoft Excel Information Disclosure Vulnerability

Summary

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-20 - Improper Input Validation
CWE-125 - Out-of-bounds Read

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

8 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Excel 2016	Affected: 16.0.0.0 , < 16.0.5539.1002 (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC for Mac 2021	Affected: 16.0.1 , < 16.106.26020821 (custom)
Microsoft	Microsoft Office LTSC for Mac 2024	Affected: 16.0.0 , < 16.106.26020821 (custom)
Microsoft	Office Online Server	Affected: 16.0.0.0 , < 16.0.10417.20097 (custom)

Date Public

2026-02-10 16:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21258",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
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CVE-2026-21259 (GCVE-0-2026-21259)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25

Title

Microsoft Excel Elevation of Privilege Vulnerability

Summary

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

6 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Excel 2016	Affected: 16.0.0.0 , < 16.0.5539.1002 (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Office Online Server	Affected: 16.0.0.0 , < 16.0.10417.20097 (custom)

Date Public

2026-02-10 16:00

Show details on NVD website

JSON

To clipboard

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CVE-2026-21260 (GCVE-0-2026-21260)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25

Title

Microsoft Outlook Spoofing Vulnerability

Summary

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

Severity

7.5 (High)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

8 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Outlook 2016	Affected: 16.0.0.0 , < 16.0.5539.1002 (custom)
Microsoft	Microsoft SharePoint Enterprise Server 2016	Affected: 16.0.0 , < 16.0.5539.1002 (custom)
Microsoft	Microsoft SharePoint Server 2019	Affected: 16.0.0 , < 16.0.10417.20097 (custom)
Microsoft	Microsoft SharePoint Server Subscription Edition	Affected: 16.0.0 , < 16.0.19127.20518 (custom)

Date Public

2026-02-10 16:00

Show details on NVD website

JSON

To clipboard

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CVE-2026-21261 (GCVE-0-2026-21261)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25

Title

Microsoft Excel Information Disclosure Vulnerability

Summary

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

8 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Excel 2016	Affected: 16.0.0.0 , < 16.0.5539.1002 (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC for Mac 2021	Affected: 16.0.1 , < 16.106.26020821 (custom)
Microsoft	Microsoft Office LTSC for Mac 2024	Affected: 16.0.0 , < 16.106.26020821 (custom)
Microsoft	Office Online Server	Affected: 16.0.0.0 , < 16.0.10417.20097 (custom)

Date Public

2026-02-10 16:00

Show details on NVD website

JSON

To clipboard

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CVE-2026-21511 (GCVE-0-2026-21511)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25

Title

Microsoft Outlook Spoofing Vulnerability

Summary

Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Severity

7.5 (High)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

10 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC for Mac 2021	Affected: 16.0.1 , < 16.106.26020821 (custom)
Microsoft	Microsoft Office LTSC for Mac 2024	Affected: 16.0.0 , < 16.106.26020821 (custom)
Microsoft	Microsoft SharePoint Enterprise Server 2016	Affected: 16.0.0 , < 16.0.5539.1002 (custom)
Microsoft	Microsoft SharePoint Server 2019	Affected: 16.0.0 , < 16.0.10417.20097 (custom)
Microsoft	Microsoft SharePoint Server Subscription Edition	Affected: 16.0.0 , < 16.0.19127.20518 (custom)
Microsoft	Microsoft Word 2016	Affected: 16.0.1 , < 16.0.5539.1002 (custom)

Date Public

2026-02-10 16:00

Show details on NVD website

JSON

To clipboard

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          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511"
        }
      ],
      "title": "Microsoft Outlook Spoofing Vulnerability"
    }
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CVE-2026-21514 (GCVE-0-2026-21514)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25

Title

Microsoft Word Security Feature Bypass Vulnerability

Summary

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-807 - Reliance on Untrusted Inputs in a Security Decision

Assigner

microsoft

References

2 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

5 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC for Mac 2021	Affected: 16.0.1 , < 16.106.26020821 (custom)
Microsoft	Microsoft Office LTSC for Mac 2024	Affected: 16.0.0 , < 16.106.26020821 (custom)

Date Public

2026-02-10 16:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

WID-SEC-W-2026-0371

CVE-2026-21258 (GCVE-0-2026-21258)

CVE-2026-21259 (GCVE-0-2026-21259)

CVE-2026-21260 (GCVE-0-2026-21260)

CVE-2026-21261 (GCVE-0-2026-21261)

CVE-2026-21511 (GCVE-0-2026-21511)

CVE-2026-21514 (GCVE-0-2026-21514)

Tags

Sightings

Nomenclature