Microsoft Exchange Server: Mehrere Schwachstellen
WID-SEC-2026-3268 · first 09.09.2026 · updated 09.09.2026 · CVSS 9,3
What it is about
Exchange ist ein Groupware und Nachrichtensystem der Firma Microsoft. Ein Angreifer kann mehrere Schwachstellen in Microsoft Exchange Server ausnutzen, um beliebigen Code auszuführen, Spoofing-Angriffe durchzuführen, erweiterte Berechtigungen zu erlangen, Daten zu manipulieren oder offenzulegen sowie einen Denial-of-Service-Angriff zu verursachen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Code auszuführen
- Spoofing-Angriffe durchzuführen
- erweiterte Berechtigungen zu erlangen
- Daten zu manipulieren oder offenzulegen sowie einen Denial-of-Service-Angriff zu verursachen
Am I affected?
Affected according to the BSI:
- Microsoft Exchange Server 2016 Cumulative Update 23
- Microsoft Exchange Server 2019 Cumulative Update 14
- Microsoft Exchange Server Subscription Edition RTM
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Microsoft Leitfaden für Sicherheitsupdates msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69361 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69380 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69355 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69378 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69375 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69382 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69641 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-69356 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-55007 msrc.microsoft.com
CVE: CVE-2026-55007, CVE-2026-69355, CVE-2026-69356, CVE-2026-69361, CVE-2026-69375, CVE-2026-69378, CVE-2026-69380, CVE-2026-69382, CVE-2026-69641
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.