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Beveilingsadvies; NCSC-2026-0010 [1.0.0]

Beveiligingsadvies
NCSC-2026-0010 [1.0.0]
Publicatie
13-01-2026 20:18 (Europe/Amsterdam)
Prioriteit
Normaal
Betreft
Kwetsbaarheden verholpen in Microsoft Office

Kenmerken

  • Improper Input Validation
  • Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  • Heap-based Buffer Overflow
  • Out-of-bounds Read
  • Integer Underflow (Wrap or Wraparound)
  • Improper Access Control
  • Use After Free
  • Untrusted Search Path
  • Deserialization of Untrusted Data
  • Untrusted Pointer Dereference
  • Server-Side Request Forgery (SSRF)

Omschrijving

Microsoft heeft kwetsbaarheden verholpen in diverse Office-producten.

Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker, toegang te krijgen tot gevoelige gegevens of willekeurige code uit te voeren in de context van het slachtoffer.

Voor succesvol misbruik moet de kwaadwillende geauthenticeerd zijn op het kwetsbare systeem, of het slachtoffer misleiden een malafide bestand te openen of link te volgen.

Microsoft Office Word: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-20944 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20948 | 7.80 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Microsoft Office SharePoint: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-20947 | 8.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20951 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20959 | 4.60 | Voordoen als andere gebruiker       | 
| CVE-2026-20963 | 8.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20958 | 5.40 | Toegang tot gevoelige gegevens      | 
|----------------|------|-------------------------------------|

Microsoft Office: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-20943 | 7.00 | Uitvoeren van willekeurige code     | 
| CVE-2026-20953 | 8.40 | Uitvoeren van willekeurige code     | 
| CVE-2026-20952 | 8.40 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Microsoft Office Excel: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-20946 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20955 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20956 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20949 | 7.80 | Omzeilen van beveiligingsmaatregel  | 
| CVE-2026-20950 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-20957 | 7.80 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Oplossingen

Microsoft heeft updates beschikbaar gesteld waarmee de beschreven kwetsbaarheden worden verholpen. We raden u aan om deze updates te installeren. Meer informatie over de kwetsbaarheden, de installatie van de updates en eventuele work-arounds vindt u op:

https://portal.msrc.microsoft.com/en-us/security-guidance

CVE's

Producten

Microsoft
Microsoft 365 Apps for Enterprise
Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft Excel 2016
Microsoft Excel 2016 (32-bit edition)
Microsoft Excel 2016 (64-bit edition)
Microsoft Office 2016
Microsoft Office 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)
Microsoft Office 2019
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Microsoft Office Deployment Tool
Microsoft Office LTSC 2021
Microsoft Office LTSC 2021 for 32-bit editions
Microsoft Office LTSC 2021 for 64-bit editions
Microsoft Office LTSC 2024
Microsoft Office LTSC 2024 for 32-bit editions
Microsoft Office LTSC 2024 for 64-bit editions
Microsoft Office LTSC for Mac 2021
Microsoft Office LTSC for Mac 2024
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft SharePoint Server Subscription Edition
Microsoft Word 2016
Microsoft Word 2016 (32-bit edition)
Microsoft Word 2016 (64-bit edition)
Office Online Server

Disclaimer

The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.