Synopsis
The retryPathname parameter can be used to create a stored cross-site scripting vulnerability on https://make.powerapps.com/startuperror.
Though unlikely, if an attacker can convince a victim user to both visit the malicious link, and press the Try Again button to trigger the XSS, the attacker could execute javascript in the context of the user's browser. If the victim is logged in to make.powerapps.com this could allow the attacker to perform actions on the user's behalf.
Solution
Microsoft has fixed the issue.Disclosure Timeline
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