CVE-2021-42558: Multiple Cross-Site Scripting in MITRE Caldera

Caldera (versions <=2.8.1) contains multiple reflected, stored and self XSS vulnerabilities that may be exploited by authenticated and unauthenticated attackers.

Vendor Disclosure:

The vendor's disclosure for this vulnerability can be found here.

Requirements:

This vulnerability requires:

• Some XSSs require valid user credentials

Proof Of Concept:

More details and the exploitation process can be found in this PDF.

Additional Information:

The XSS vector "1.1. Unauthenticated Stored XSS in Agent" was also found in paralel and fixed by Daniel "uruwhy" Matthews in this Caldera commit.