Cross-Site Scripting in Silverstripe CMS

Publication date: 2026-07-01

Last updated on: 2026-07-01

Assigner: GitHub, Inc.

Description

Silverstripe Framework is a PHP framework which powers the Silverstripe CMS. In versions prior to 6.2.2, the "Insert media from web" functionality in the CMS is vulnerable to XSS from a specially crafted embed. This issue was fixed in version 6.2.2/

CVSS Scores

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Meta Information

Published

2026-07-01

Last Modified

2026-07-01

Generated

2026-07-02

AI Q&A

2026-07-02

EPSS Evaluated

N/A

NVD

CVE-2026-54720

Affected Vendors & Products

Vendor	Product	Version / Range
silverstripe	silverstripe_framework	to 6.2.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

The vulnerability exists in the Silverstripe Framework, a PHP framework used by the Silverstripe CMS. Specifically, in versions prior to 6.2.2, the "Insert media from web" functionality in the CMS is vulnerable to Cross-Site Scripting (XSS) attacks. This happens when a specially crafted embed is used, allowing an attacker to inject malicious scripts.

Impact Analysis

This vulnerability can impact users by allowing attackers to execute malicious scripts in the context of the affected CMS. This can lead to the theft of sensitive information, session hijacking, or other malicious actions that compromise the integrity and confidentiality of the system.

Mitigation Strategies

To mitigate this vulnerability, upgrade the Silverstripe Framework to version 6.2.2 or later, where the issue with the "Insert media from web" functionality being vulnerable to XSS has been fixed.

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