CVE-2020-5809

PoC —

CVSS 3.1

5.4 medium

EPSS

<1%p50

Published

Dec 30, 2020 (Dec 30, 2020)

Modified

Jun 17, 2026

Description

A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor, as TinyMCE is configured to allow iframes by default in Umbraco CMS.

Vendors: umbraco
Products: umbraco cms
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.7%)

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