Silverstripe Hostname, IP and Protocol Spoofing through HTTP HeadersGHSA-87pf-7x99-5xc4
MEDIUMFix: silverstripe/silverstripe-framework@37059ebGHSA-87pf-7x99-5xc4 is a medium-severity (CVSS 6.5) vulnerability in silverstripe/framework. A fix is available for silverstripe/framework — see the affected versions and patch details below.
Real-World Exposure
silverstripe/framework🐘silverstripe/framework🐘silverstripe/frameworkReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
In it's default configuration, SilverStripe trusts all originating IPs to include HTTP headers for Hostname, IP and Protocol. This enables reverse proxies to forward requests while still retaining the original request information. Trusted IPs can be limited via the SS_TRUSTED_PROXY_IPS constant. Even with this restriction in place, SilverStripe trusts a variety of HTTP headers due to different proxy notations (e.g. X-Forwarded-For vs. Client-IP). Unless a proxy explicitly unsets invalid HTTP headers from connecting clients, this can lead to spoofing requests being passed through trusted proxies.
The impact of spoofed headers can include Director::forceSSL() not being enforced, SS_HTTPRequest->getIP() returning a wrong IP (disabling any IP restrictions), and spoofed hostnames circumventing any hostname-specific restrictions enforced in SilverStripe Controllers.
Regardless on running a reverse proxy in your hosting infrastructure, please follow the instructions on Secure Coding: Request hostname forgery in order to opt-in to these protections. If your website is not behind a reverse proxy, you might already be protected if using Apache with mod_env enabled, and you have the following line in your .htaccess file: SetEnv BlockUntrustedIPs true.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | silverstripe/framework | all versions | 3.1.17composer require silverstripe/framework:^3.1.17 |
| 🐘Packagist | silverstripe/framework | ≥ 3.2.0&&< 3.2.2 | 3.2.2composer require silverstripe/framework:^3.2.2 |
| 🐘Packagist | silverstripe/framework | ≥ 3.3.0-beta1&&< 3.3.0 | 3.3.0composer require silverstripe/framework:^3.3.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update silverstripe/framework to 3.1.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-87pf-7x99-5xc4 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is GHSA-87pf-7x99-5xc4 in your dependencies?
Find it across Packagist, including transitive dependencies.