GHSA-6hh6-59j2-qrxw: Silverstripe History XSS Vulnerability

May 22, 2024

A cross-site scripting vulnerability has been discovered in the CMS page history tab.

This vulnerability can only be exploited if a user with CMS access has posted malicious or unescaped HTML into any of the text fields on a page, and if the “compare mode” option is selected. The HTML will be embedded into the page unescaped.

This has been resolved by performing the text comparison in a HTML friendly way.

References

github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/cms/SS-2015-003-1.yaml
github.com/advisories/GHSA-6hh6-59j2-qrxw
github.com/silverstripe/silverstripe-cms
www.silverstripe.org/software/download/security-releases/ss-2015-003

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