Fake Anthropic AI preview invites target Google and Microsoft accounts

Oct 29, 2026
A phishing campaign uses invitations to a private Anthropic AI preview to steal Google and Microsoft account details. The attack uses legitimate services, shortened links and two CAPTCHA checks to avoid automated analysis.

Cofense detailed in a company blog post a phishing campaign that has used fake invitations to a private Anthropic AI preview since September 2026. The emails seek Google and Microsoft account details from employees.

The campaign abuses GoTo Webinar to distribute invitations and uses a Zapier shortened link. Recipients pass through a Cloudflare CAPTCHA before reaching a page that imitates a Zoom meeting invitation, despite the GoTo Webinar branding in the original email.

Users who register with a work email and select Google or Microsoft encounter a second CAPTCHA before reaching a fake login page. Cofense found that the Google page captured usernames, while the Microsoft version captured usernames and passwords. The two CAPTCHA checks can prevent automated security tools from reaching and analyzing the credential theft pages.

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