Microsoft Discovers OAuth Redirects Are Shit, Film at 11

Oh look, Microsoft finally figured out that OAuth redirects are about as secure as a chocolate teapot in a fucking furnace. Apparently some clever bastards have been using these redirect URIs to sling malware directly at government targets. Who’d have fucking thought that redirecting users all over the bloody internet like a damned pinball machine could possibly go wrong?

The article says attackers are abusing OAuth apps to redirect unsuspecting users to malware-infested shitholes. Government agencies are getting hit because their IT departments are too busy configuring their bloody printers to notice that Bob from Accounting just gave his credentials to a domain that looks like “micros0ft-secure-login.totally-legit.ru” with a favicon nicked from a GeoCities archive.

Microsoft is acting like this is some groundbreaking revelation, but any sysadmin worth their salt has known OAuth is a Swiss cheese of security compromises since the dawn of fucking time. “Oh no, attackers are exploiting trust relationships!” No shit, Sherlock. That’s what happens when you build an authentication system that relies on users actually looking at URLs before clicking “Accept”. Users can’t even spot a phishing email from their own mother asking for iTunes gift cards, let alone notice a malicious redirect parameter snuck into a legitimate-looking Microsoft login flow.

So now we have state-sponsored wankers delivering payloads via legitimate Microsoft 365 OAuth flows, making their malware look about as legitimate as a politician’s promise. And the best part? These tokens are persistent little bastards, so even when you kick them out once, they’ve probably already nested in your infrastructure like a family of rats in a skip behind a kebab shop.

https://thehackernews.com/2026/03/microsoft-warns-oauth-redirect-abuse.html

Reminds me of the time I had to deal with a user who clicked an OAuth prompt for “Microsift Teems” that asked for permissions to “read all emails and send wire transfers on behalf of CEO”. When I asked why he approved it, he said “the logo looked legit”. I “accidentally” configured his Outlook to auto-reply to all emails with “I am a security risk and should not be trusted with sharp objects” for three weeks. The CIO wasn’t amused, but neither was I when I had to purge 400GB of crypto-mining malware from the Exchange server while he stood there asking if he could still get to Facebook.

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