PT-2021-16803 · Packagist · Silverstripe/Framework

Published 2021-06-08 · Updated 2022-05-24 · CVE-2021-25817

Telegram · Cvenotify

CVSS v3.1

4.8

Medium

Base vector

AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

🚨 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]).

🎖@cveNotify

Fix

XXE

Weakness Enumeration

CWE-611

Related Identifiers

CVE-2021-25817

GHSA-3VJC-5X79-M9R8

Affected Products

Silverstripe/Framework

References · 8

• https://osv.dev/vulnerability/GHSA-3vjc-5x79-m9r8 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-25817 · Security Note
• https://github.com/silverstripe/silverstripe-framework · Note
• https://t.me/cvenotify/15877 · Telegram Post
• https://silverstripe.org/download/security-releases/cve-2021-25817 · Note
• https://silverstripe.org/download/security-releases · Note
• https://silverstripe.org/blog/tag/release · Note
• https://forum.silverstripe.org/c/releases · Note