CVE-2023-46744

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Summary

CVECVE-2023-46744
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-11-07 18:15:00 UTC
Updated2023-11-14 20:07:00 UTC
DescriptionSquidex is an open source headless CMS and content management hub. In affected versions a stored Cross-Site Scripting (XSS) vulnerability enables privilege escalation of authenticated users. The SVG element filtering mechanism intended to stop XSS attacks through uploaded SVG images, is insufficient resulting to stored XSS attacks. Squidex allows the CMS contributors to be granted the permission of uploading an SVG asset. When the asset is uploaded, a filtering mechanism is performed to validate that the SVG does not contain malicious code. The validation logic consists of traversing the HTML nodes in the DOM. In order for the validation to succeed, 2 conditions must be met: 1. No HTML tags included in a "blacklist" called "InvalidSvgElements" are present. This list only contains the element "script". and 2. No attributes of HTML tags begin with "on" (i.e. onerror, onclick) (line 65). If either of the 2 conditions is not satisfied, validation fails and the file/asset is not uploaded. However it is possible to bypass the above filtering mechanism and execute arbitrary JavaScript code by introducing other HTML elements such as an <iframe> element with a "src" attribute containing a "javascript:" value. Authenticated adversaries with the "assets.create" permission, can leverage this vulnerability to upload a malicious SVG as an asset, targeting any registered user that will attempt to open/view the asset through the Squidex CMS.

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Squidex.io Squidex All All All All

References

ReferenceSourceLinkTags
Stored XSS via insufficient SVG element filtering · Advisory · Squidex/squidex · GitHub github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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