SharePoint phishing has become one of the most effective tactics used by attackers to compromise user credentials—and it's working because it looks familiar.
If your team uses Microsoft 365, you're likely sharing and receiving SharePoint links regularly. That convenience is exactly what attackers are counting on.
Here’s the Red Flag:
If someone shares a SharePoint document with you, you should not be prompted to log in again—especially if you’re already signed in to Office 365 in your browser or desktop apps.
If you’re already authenticated, you shouldn’t have to authenticate again.
Phishing campaigns often mimic the Microsoft SharePoint sharing experience. They send a link that looks like a legitimate SharePoint document. But when you click the link, instead of seeing the document, you're redirected to a fake Microsoft login page.
It looks real. It uses a Microsoft logo. It even may copy the same fonts and layout. But when you enter your credentials, they go straight to the attacker—not to Microsoft.
What to Look Out For:
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Unexpected prompts for login credentials
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Links that don’t start with "https://<your-company>.sharepoint.com"
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Email sender addresses that don’t match internal patterns
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Spelling or formatting errors in the message
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File names that are vague (“Invoice_2025.pdf”, “Doc_Review.docx”)
Additional Protection Tip: Use Safe Links
If your organization is using Microsoft Defender for Office 365, ensure Safe Links are enabled. This feature rewrites and scans links in emails and Office documents to detect known malicious sites—helping prevent a successful phish even if someone clicks.
What You Can Do:
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Trust your login session – If you're already logged in and suddenly asked to log in again, stop and inspect.
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Hover over the link – Check where it actually goes before clicking.
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Use Microsoft’s built-in reporting tools – Flag any suspicious emails in Outlook.
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Enable MFA – If your credentials are ever stolen, this extra layer can prevent full compromise.
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Educate your team – Share this post or incorporate the message into your security awareness efforts.
Final Thought:
The phishing playbook hasn’t changed much. What’s changed is how well it blends in. SharePoint and Microsoft 365 phishing work because they exploit a moment of trust. That moment is where attackers win—or where you shut them down.
Stay sharp. You’re already logged in. Don’t give your credentials away.
If you or your team received a suspicious SharePoint link or entered credentials into a fake login page—contact Critical Path Security immediately. Our SOC team can assess, respond, and lock down your environment before further damage is done.
Email us: sales@criticalpathsecurity.com
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