GHSA-vcg6-8fxc-x5cq
silverstripe/framework allows upload of dangerous file types
GHSA-vcg6-8fxc-x5cq is a high vulnerability (CVSS 8.8) in silverstripe/framework, published May 27, 2024. No source lists public exploit code. Fixed in silverstripe/framework 3.6.6.
- Severity
- 8.8 HighCVSS 3.1, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
3.6.6silverstripe/framework +5 more
Description
Some potentially dangerous file types exist in File.allowed_extensions which could allow a malicious CMS user to upload files that then get executed in the security context of the website. We have removed the ability to upload .css, .js, .potm, .dotm, .xltm and .jar files in the default configuration. Since allowed_extensions are synced to webserver configuration (in assets/.htaccess) automatically, this will also deny access to any existing uploads with these extensions.
Review our security guidelines for the Common Web Platform and the File Security guide for SilverStripe 4 to find out how to add or remove extensions.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Affected packages
| Package | Affected | Fixed |
|---|---|---|
silverstripe/frameworkPackagist | 3.6.5-rc1 up to 3.6.6 | 3.6.6 |
silverstripe/frameworkPackagist | 4.0.3-rc1 up to 4.0.4 | 4.0.4 |
silverstripe/frameworkPackagist | 4.1.0-rc1 up to 4.1.1 | 4.1.1 |
silverstripe/frameworkPackagist | 3.6.5-rc1 up to 3.6.6, plus listed versions 3.6.53.6.6-rc1 | 3.6.6 |
silverstripe/frameworkPackagist | 4.0.3-rc1 up to 4.0.4, plus listed versions 4.0.3 | 4.0.4 |
silverstripe/frameworkPackagist | 4.1.0-rc1 up to 4.1.1, plus listed versions 4.1.04.1.0-rc2 | 4.1.1 |
What each source reports
GitHub Advisories Score used
silverstripe/framework allows upload of dangerous file types
Some potentially dangerous file types exist in File.allowed_extensions which could allow a malicious CMS user to upload files that then get executed in the security context of the website. We have removed the ability to upload .css, .js, .potm, .dotm, .xltm and .jar files in the default configuration. Since allowed_extensions are synced to webserver configuration (in assets/.htaccess) automatically, this will also deny access to any existing uploads with these extensions.
Review our security guidelines for the Common Web Platform and the File Security guide for SilverStripe 4 to find out how to add or remove extensions.
- Record
GHSA-vcg6-8fxc-x5cq- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
OSV
silverstripe/framework allows upload of dangerous file types
Some potentially dangerous file types exist in File.allowed_extensions which could allow a malicious CMS user to upload files that then get executed in the security context of the website. We have removed the ability to upload .css, .js, .potm, .dotm, .xltm and .jar files in the default configuration. Since allowed_extensions are synced to webserver configuration (in assets/.htaccess) automatically, this will also deny access to any existing uploads with these extensions.
Review our security guidelines for the Common Web Platform and the File Security guide for SilverStripe 4 to find out how to add or remove extensions.
- Record
GHSA-vcg6-8fxc-x5cq- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
github.com/silverstripe/silverstripe-framework/commit/0408048653fafc52e02b4dbc6288e14e634ac613
silverstripe.org/download/security-releases/ss-2018-014