A cross-site scripting (XSS) vulnerability in the Document Link of documents in ESRI ArcGIS Online before 10.9 and Enterprise before 10.9 allows remote authenticated users to inject arbitrary JavaScript code via a malicious HTML attribute such as onerror (in the URL field of the Parameters tab).
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CVE-2021-28477
CVE-2021-28482
CVE-2021-28483