What’s Vulnerable › Vulnerabilities

CVE-2020-25817

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-08 · updated 2026-06-17
• Weakness: CWE-611

Description

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]).

Affected products

• Silverstripe: before 4.6.0; 4.6.0-rc1 — fixed in 4.6.0

How to fix

Upgrade to a fixed version: Silverstripe 4.6.0. Check the vendor advisory for mitigations.

References

• https://forum.silverstripe.org/c/releases
• https://www.silverstripe.org/blog/tag/release
• https://www.silverstripe.org/download/security-releases/
• https://www.silverstripe.org/download/security-releases/cve-2020-25817
• https://forum.silverstripe.org/c/releases
• https://www.silverstripe.org/blog/tag/release
• https://www.silverstripe.org/download/security-releases/
• https://www.silverstripe.org/download/security-releases/cve-2020-25817

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