Some users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams
ID: MO1148487
Issue type: Incident
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Status
Service Degradation
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Impacted services
Microsoft 365 suite, Exchange Online, Microsoft Teams, Microsoft Defender XDR
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Details
Title: Some users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams
User impact: Users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams.
More info: Additionally, admins may receive alerts titled "A potentially malicious URL click was detected involving one user", however the URLs have been confirmed as safe.
Some email messages may have also been incorrectly quarantined.
Current status: Our investigation has identified that an anti-spam service incorrectly flagged URLs contained within other URLs as potentially malicious, resulting in impact. We've identified over 6,000 URLs that are affected and are working to unblock them before replaying messages to recover any messages or URLs that were incorrectly flagged.
Scope of impact: Any user receiving email messages containing specific URLs may be affected.
Root cause: An anti-spam service incorrectly flagged URLs contained within other URLs as potentially malicious, resulting in impact.
Next update by: Friday, September 5, 2025, at 10:00 PM UTC
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