Silverstripe CMS XSS Vulnerability
In SilverStripe through 4.5, malicious users with a valid Silverstripe CMS login (usually CMS access) can craft profile information which can lead to XSS for other users through specially crafted login form URLs.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | silverstripe/cms | <= 4.5.0 | no fix |
| Composer package | silverstripe/framework | >= 3.0.0, < 3.7.5 | 3.7.5 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-9311
- https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2020-9311.yaml
- https://github.com/silverstripe/silverstripe-cms
- https://www.silverstripe.org/download/security-releases/CVE-2020-9311
- https://www.silverstripe.org/download/security-releases/cve-2020-9311
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
silverstripe/cms, silverstripe/framework- Disclosed
- 24.05.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2pw2-qpcp-m47x - CC BY 4.0
Vulnerability history: silverstripe/cms
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 16
- First → latest
- 11.2019 08.2026
- Without a fix
- 4
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 3
- Medium 11
- Low 1
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 11
- 2023: 0
- 2024: 3
- 2025: 0
- 2026: 1
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