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Stored XSS in make.powerapps.com

Medium

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

March 26, 2021 - Vulnerability reported to MSRC
March 30, 2021 - Vulnerability confirmed by MSRC
April 21, 2021 - Issue confirmed fixed by Microsoft

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Risk Information

Tenable Advisory ID: TRA-2021-12
Credit:
Evan Grant
CVSSv2 Base / Temporal Score:
4.3
CVSSv2 Vector:
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSSv3 Base / Temporal Score:
4.3
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Affected Products:
Microsoft Power Apps platform
Risk Factor:
Medium