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Security Advisory; NCSC-2026-0185 [1.0.0]

Security Advisory
NCSC-2026-0185 [1.0.0]
Publicatie
09-06-2026 20:35 (Europe/Amsterdam)
Prioriteit
Normaal
Betreft
Kwetsbaarheden verholpen in Microsoft Exchange

Kenmerken

  • Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • Improper Control of Generation of Code ('Code Injection')
  • Improper Authorization
  • Server-Side Request Forgery (SSRF)

Omschrijving

Microsoft heeft kwetsbaarheden verholpen in Exchange, zowel on-premise als online.

Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker en toegang te krijgen tot gevoelige gegevens. Ook kan de kwaadwillende mogelijk willekeurige code uitvoeren.

De ernstigste kwetsbaarheid bevond zich in Exchange Online en heeft kenmerk CVE-2026-48579 toegewezen gekregen. Deze kwetsbaarheid is reeds centraal verholpen door Microsoft en vereist geen verdere actie. De kwetsbaarheid is ter informatie opgenomen.

Microsoft Exchange Online: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-48579 | 9.10 | Toegang tot gevoelige gegevens      | 
|----------------|------|-------------------------------------|

Microsoft Exchange Server: 
|----------------|------|-------------------------------------|
| CVE-ID         | CVSS | Impact                              |
|----------------|------|-------------------------------------|
| CVE-2026-45500 | 6.10 | Voordoen als andere gebruiker       | 
| CVE-2026-45501 | 6.50 | Voordoen als andere gebruiker       | 
| CVE-2026-45502 | 5.00 | Toegang tot gevoelige gegevens      | 
| CVE-2026-45503 | 8.10 | Toegang tot gevoelige gegevens      | 
| CVE-2026-45504 | 8.80 | Verkrijgen van verhoogde rechten    | 
| CVE-2026-45583 | 7.50 | Uitvoeren van willekeurige code     | 
| CVE-2026-47631 | 8.10 | Voordoen als andere gebruiker       | 
|----------------|------|-------------------------------------|

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
Exchange
Microsoft Exchange Online
Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 14
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft Exchange Server Subscription Edition RTM

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.