CVE-2020-25817 json
SilverStripe XXE Vulnerability in CSSContentParser
published 2021-06-08 5 y ago modified 2026-06-17 4 mo ago also BIT-silverstripe-2020-25817 , EUVD-2022-2244 , GHSA-3vjc-5x79-m9r8
- cvss
- 4.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
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]).
Patch / fix
- packagist silverstripe/framework 4.7.4
- bitnami silverstripe 4.6.0
- silverstripe silverstripe 4.6.0
Exploit prediction
0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
| OSV | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | silverstripe/framework | >=4.0.0, <4.7.4 |
4.7.4 |
| bitnami | silverstripe | <4.6.0 >=4.6.0-rc1, <=4.6.0-rc1 |
4.6.0 |
Classification
- Weakness
-
- CWE-611 Improper Restriction of XML External Entity Reference
References
-
silverstripe.org
/download/security-releases/
vendor-advisory, web
-
silverstripe.org
/blog/tag/release
web, release-notes, vendor-advisory
-
forum.silverstripe.org
/c/releases
web, release-notes, vendor-advisory
-
silverstripe.org
/download/security-releases/cve-2020-25817
broken-link, web
-
nvd.nist.gov
/vuln/detail/CVE-2020-25817
advisory
-
github.com
/silverstripe/silverstripe-framework
package
-
silverstripe.org
/download/security-releases
web
-
silverstripe.org
/download/security-releases/cve-2021-25817
web
Sources
- CVE List CVE-2020-25817
- GitHub Advisory GHSA-3vjc-5x79-m9r8
- NVD CVE-2020-25817
- OSV BIT-silverstripe-2020-25817
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.