Kurzer Hinweis für Windows-Benutzer: Der Microsoft Defender for Office 365 dreht nach einem Definitions-Update durch und stuft wohl legitime Google-Suchlinks als bösartig ein. Microsoft hat das Problem eingestanden und untersucht diesen Fall.
Auf X tauchten vor einigen Stunden Tweets auf, die sich darüber beklagten, dass der Microsoft Defender Google-Links als "schädlich" bemängelt und fragten, ob andere Nutzer das auch feststellen.
Microsoft hat bereits zum 1. September 2026 den Statusbeitrag MO1465962 Some users may have been unable to open Google search links from email and Microsoft Teams messages zu dieser Störung gepostet. Bleeping Computer hat das Thema zum 2. September 2026 in diesem Beitrag aufgegriffen. Die Störung betrifft den Microsoft Defender for Office 365 (insbesondere die Funktion Safe Links).
Laut Microsoft können Benutzer möglicherweise keine Google-Suchlinks aus E-Mails und Microsoft Teams-Nachrichten öffnen. Aufgrund einer fehlerhaften Klassifizierung stuft das System legitime Google-Suchlinks fälschlicherweise als bösartig ein. Benutzer erhalten die Warnmeldung "Das Öffnen dieser Website ist möglicherweise nicht sicher" ("Opening this website might not be safe"), wenn sie versuchen, über blockierte Hyperlinks auf Google URLs zuzugreifen.
IT-Administratoren sehen möglicherweise vermehrt Fehlalarme und automatische Sicherheitsmeldungen in Microsoft Sentinel oder im Microsoft Defender Portal. Das Kopieren des Hyperlinks und das direkte Einfügen in einen Browser umgeht die Warnung nicht.
Microsoft gibt inzwischen an, die fehlerhafte Sicherheitsklassifizierung korrigiert zu haben, und interne Tests würden zeigen, dass das Problem dadurch erfolgreich behoben wurde. Bei einigen Benutzern können jedoch für einen begrenzten Zeitraum weiterhin Auswirkungen auftreten, während die Abhilfemaßnahme in der Service-Infrastruktur umgesetzt wird. Wir setzen uns mit einer Reihe betroffener Benutzer in Verbindung, um zu überprüfen, ob die Behebung abgeschlossen ist. Hier noch der Text der betreffenden Meldung – war jemand betroffen?
MO1465962 – Some users may have been unable to open Google search links from email and Microsoft Teams messages
Status: serviceRestored
Start Time: Tue Sep 1 22:53:00 2026
End Time: Wed Sep 2 07:24:26 2026
Service: Microsoft 365 suite
Feature Group: Administration
Classification: advisory
Last Updated: Wed Sep 2 07:25:56 2026
Root Cause: An inaccurate security classification caused legitimate Google search URLs to be incorrectly identified as malicious, resulting in Microsoft Defender for Office 365 Safe Links blocking access to affected links.
Next Update: N/A
collapse section DetailsTime: Wed Sep 2 07:25:52 2026
Description: Title: Some users may have been unable to open Google search links from email and Microsoft Teams messages
User impact: Users may have been unable to open Google search links from email and Microsoft Teams messages.
More info: Microsoft Defender for Office 365 Safe Links may have blocked the opening of Google search links (URLs), identifying them as malicious. In addition, admins may have received related alerts and incidents in the Microsoft Defender portal and Microsoft Sentinel as a result of these detections. Affected users received the following message when attempting to open the Google search links:
"Opening this website might not be safe"
Copying the hyperlink and pasting it directly into a browser didn't bypass the warning.
Final status: We've received confirmation that the issue has been successfully resolved. However, some users may continue to experience impact for a limited time while the mitigation propagates through the service infrastructure.
Scope of impact: Some users attempting to open Google search links from email and Microsoft Teams messages may have been impacted.
Start time: Wednesday, September 2, 2026, at 2:53 AM UTC
End time: Wednesday, September 2, 2026, at 10:17 AM UTC
Root cause: An inaccurate security classification caused legitimate Google search URLs to be incorrectly identified as malicious, resulting in Microsoft Defender for Office 365 Safe Links blocking access to affected links.
Next steps: – We're reviewing our URL reputation classification processes to help prevent similar false-positives in the future.
This is the final update for the event.
Time: Wed Sep 2 06:37:02 2026
Description: Title: Some users may be unable to open Google search links from email and Microsoft Teams messages
User impact: Users may be unable to open Google search links from email and Microsoft Teams messages.
More info: Microsoft Defender for Office 365 Safe Links may block the opening of Google search links (URLs), identifying them as malicious. In addition, admins may receive related alerts and incidents in the Microsoft Defender portal and Microsoft Sentinel as a result of these detections. Affected users receive the following message when attempting to open the Google search links:
"Opening this website might not be safe"
Copying the hyperlink and pasting it directly into a browser doesn't bypass the warning.
Current status: We've corrected the inaccurate security classification, and internal testing indicates that this has successfully resolved the issue. However, some users may continue to experience impact for a limited time while the mitigation propagates through the service infrastructure. We're reaching out to a number of affected users to validate that remediation is complete.
Scope of impact: Some users attempting to open Google search links from email and Microsoft Teams messages may be impacted.
Start time: Wednesday, September 2, 2026, at 2:53 AM UTC
Root cause: An inaccurate security classification is causing legitimate Google search URLs to be incorrectly identified as malicious, resulting in Microsoft Defender for Office 365 Safe Links blocking access to affected links.
Next update by: Wednesday, September 2, 2026, at 12:30 PM UTC
Time: Wed Sep 2 05:58:38 2026
Description: Title: Some users may be unable to open Google search links from email and Microsoft Teams messages
User impact: Users may be unable to open Google search links from email and Microsoft Teams messages.
More info: Microsoft Defender for Office 365 Safe Links may block the opening of Google search links (URLs), identifying them as malicious. In addition, admins may receive related alerts and incidents in the Microsoft Defender portal and Microsoft Sentinel as a result of these detections. Affected users receive the following message when attempting to open the Google search links:
"Opening this website might not be safe"
Copying the hyperlink and pasting it directly into a browser doesn't bypass the warning.
Current status: We've determined that an inaccurate security classification is causing legitimate Google search URLs to be incorrectly identified as malicious, resulting in Microsoft Defender for Office 365 Safe Links blocking access to affected links. We're working to correct the misclassification to remediate impact.
Scope of impact: Some users attempting to open Google search links from email and Microsoft Teams messages may be impacted.
Start time: Wednesday, September 2, 2026, at 2:53 AM UTC
Root cause: An inaccurate security classification is causing legitimate Google search URLs to be incorrectly identified as malicious, resulting in Microsoft Defender for Office 365 Safe Links blocking access to affected links.
Next update by: Wednesday, September 2, 2026, at 12:00 PM UTC
Time: Wed Sep 2 04:25:05 2026
Description: Title: Some users may be unable to open Google search links from email and Microsoft Teams messages
User impact: Users may be unable to open Google search links from email and Microsoft Teams messages.
More info: Microsoft Defender for Office 365 Safe Links may block the opening of Google search links (URLs), identifying them as malicious. In addition, admins may receive related alerts and incidents in the Microsoft Defender portal and Microsoft Sentinel as a result of these detections. Affected users receive the following message when attempting to open the Google search links:
"Opening this website might not be safe"
Copying the hyperlink and pasting it directly into a browser doesn't bypass the warning.
Current status: We're reviewing affected alert IDs for a subset of impacted users, while also analyzing blocked links and their source, to determine why legitimate Google search URLs are being classified as malicious.
Scope of impact: Some users attempting to open Google search links from email and Microsoft Teams messages may be impacted.
Next update by: Wednesday, September 2, 2026, at 10:30 AM UTC
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