NCSC | Beveiligingsadviezen
Bekijk RSS-feed

Beveiligingsadviezen

Download

Beveilingsadvies; NCSC-2026-0144 [1.0.0]

Beveiligingsadvies
NCSC-2026-0144 [1.0.0]
Publicatie
12-05-2026 19:53 (Europe/Amsterdam)
Prioriteit
Normaal
Betreft
Kwetsbaarheden verholpen in Microsoft Office

Kenmerken

  • External Control of File Name or Path
  • Heap-based Buffer Overflow
  • Out-of-bounds Read
  • Improper Access Control
  • Improper Authorization
  • Use After Free
  • Deserialization of Untrusted Data
  • Files or Directories Accessible to External Parties
  • Untrusted Pointer Dereference
  • Access of Resource Using Incompatible Type ('Type Confusion')
  • Use of Uninitialized Resource
  • Insufficient Granularity of Access Control

Omschrijving

Microsoft heeft kwetsbaarheden verholpen in diverse Office producten.

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

Voor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden een malafide bestand te openen of link te volgen.

De kwetsbaarheid met kenmerk CVE-2026-33823 is reeds door Microsoft centraal verholpen en slechts toegevoegd ter informatie. Er zijn geen verdere acties benodigd voor deze kwetsbaarheid.

Microsoft Teams: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-32185 | 5.50 | Voordoen als andere gebruiker       | 
| CVE-2026-33823 | 9.60 | Toegang tot gevoelige gegevens      | 
|----------------|------|-------------------------------------|

Microsoft Office PowerPoint: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-41102 | 7.10 | Voordoen als andere gebruiker       | 
|----------------|------|-------------------------------------|

M365 Copilot: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-42893 | 7.40 | <Vertaal: Tampering>                | 
|----------------|------|-------------------------------------|

Microsoft Office Word: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-35440 | 5.50 | Toegang tot gevoelige gegevens      | 
| CVE-2026-40364 | 8.40 | Uitvoeren van willekeurige code     | 
| CVE-2026-40366 | 8.40 | Uitvoeren van willekeurige code     | 
| CVE-2026-40421 | 4.30 | Toegang tot gevoelige gegevens      | 
| CVE-2026-40361 | 8.40 | Uitvoeren van willekeurige code     | 
| CVE-2026-40367 | 8.40 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Office for Android: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-42831 | 7.80 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Microsoft Office: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-40363 | 8.40 | Uitvoeren van willekeurige code     | 
| CVE-2026-40419 | 7.80 | Verkrijgen van verhoogde rechten    | 
| CVE-2026-40358 | 8.40 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Microsoft Office SharePoint: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-35439 | 8.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-40368 | 8.00 | Uitvoeren van willekeurige code     | 
| CVE-2026-33110 | 8.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-33112 | 8.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-40357 | 8.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-40365 | 8.80 | Uitvoeren van willekeurige code     | 
|----------------|------|-------------------------------------|

Microsoft Office Excel: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-40360 | 7.80 | Toegang tot gevoelige gegevens      | 
| CVE-2026-40359 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-40362 | 7.80 | Uitvoeren van willekeurige code     | 
| CVE-2026-42832 | 7.70 | Voordoen als andere gebruiker       | 
|----------------|------|-------------------------------------|

Microsoft Office Click-To-Run: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-40418 | 7.80 | Verkrijgen van verhoogde rechten    | 
| CVE-2026-35436 | 8.80 | Verkrijgen van verhoogde rechten    | 
| CVE-2026-40420 | 8.80 | Verkrijgen van verhoogde rechten    | 
|----------------|------|-------------------------------------|

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 for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft Excel 2016 (32-bit edition)
Microsoft Excel 2016 (64-bit edition)
Microsoft Excel for Android
Microsoft Office 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Microsoft Office LTSC 2021 for 32-bit editions
Microsoft Office LTSC 2021 for 64-bit editions
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 Office for Android
Microsoft Outlook for iOS
Microsoft PowerPoint for Android
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft SharePoint Server Subscription Edition
Microsoft Teams
Microsoft Teams for Android
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.