CVE-2020-25817

MEDIUM
4.8
CVSS Score
Published: June 8, 2021 at 05:54 PM UTC
Updated: June 17, 2026 at 03:07 AM UTC
1 product affected across 1 vendorSilverstripe

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.8%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.6.04.6.0 rc1
Affected range stops below 4.6.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (4)

x_refsource_MISCRelease NotesVendor Advisory
https://forum.silverstripe.org/c/releases
x_refsource_MISCRelease NotesVendor Advisory
https://www.silverstripe.org/blog/tag/release
x_refsource_CONFIRMx_refsource_MISCVendor Advisory
https://www.silverstripe.org/download/security-releases/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-611

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