CVE-2020-25817

SilverStripe through 4.6.0-rc1 has an XXE Vulnerability in CSSContentParser. A developer utility meant for parsing HTML within unit tests can be vulnerable to XML External Entity (XXE) attacks. When this developer utility is misused for purposes involving external or user submitted data in custom project code, it can lead to vulnerabilities such as XSS on HTML output rendered through this custom code. This is now mitigated by disabling external entities during parsing. (The correct CVE ID year is 2020 [CVE-2020-25817, not CVE-2021-25817]).

• CWE-611

• https://forum.silverstripe.org/c/releasesRelease Notes, Vendor Advisory
• https://www.silverstripe.org/blog/tag/releaseRelease Notes, Vendor Advisory
• https://www.silverstripe.org/download/security-releases/Vendor Advisory
• https://www.silverstripe.org/download/security-releases/cve-2020-25817Broken Link
• https://forum.silverstripe.org/c/releasesRelease Notes, Vendor Advisory
• https://www.silverstripe.org/blog/tag/releaseRelease Notes, Vendor Advisory
• https://www.silverstripe.org/download/security-releases/Vendor Advisory
• https://www.silverstripe.org/download/security-releases/cve-2020-25817Broken Link

Published

Jun 8, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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