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Generated remediation guidance and an executive summary. No account required.
Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows stored XSS, with resultant code execution, because an uploaded file can be placed in an IFRAME element within user-generated content. For code execution, the attacker can rely on the ability of an admin to install widgets, disclosure of the admin session ID in a Referer header, and the ability of an admin to use the templating engine (e.g., Edit HTML).
Use CWE-79, Invisioncommunity vendor hub and Invision Power Board product page to widen CVE-2021-39250 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2013-3725, CVE-2012-2226 and CVE-2017-8898 for nearby disclosures in the same product family.