CVE-2020-25817: Improper Restriction of XML External Entity Reference

June 8, 2021 (updated June 17, 2021)

SilverStripe 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.

References

forum.silverstripe.org/c/releases
nvd.nist.gov/vuln/detail/CVE-2020-25817
www.silverstripe.org/blog/tag/release
www.silverstripe.org/download/security-releases/

Code Behaviors & Features

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