GMS-2022-6855: Stored XSS in custom meta tags

November 21, 2022

A malicious content author could create a custom meta tag and execute an arbitrary JavaScript payload. This would require convincing a legitimate user to access a page and enter a custom keyboard shortcut. This requires CMS access to exploit.

References

github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/cms/CVE-2022-37421.yaml
github.com/advisories/GHSA-pp74-g2q5-j4jf
www.silverstripe.org/download/security-releases/cve-2022-37421

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