GHSA-25gq-jvx2-vg9x
HIGHSilverstripe X-Forwarded-Host request hostname injection
Blast Radius
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Description
A potential hostname injection vulnerability has been found which could allow attackers to alter url resolution.
If a request contains the X-Forwarded-Host HTTP header a website would then use its value in place of the actual HTTP hostname. In cases where caching is enabled, this could allow an attacker to potentially embed a remote url as the base_url for any site. This would then cause other visitors to the site to be redirected unknowingly.
This header is necessary for servers running behind a reverse proxy (such as nginx). Such servers are likely not vulnerable to this risk.
A fix has been merged into the default installer, although existing projects which do not run behind a reverse proxy should update their htaccess as below:
<IfModule mod_headers.c>
# Remove X-Forwarded-Host header sent as a part of any request from the web
RequestHeader unset X-Forwarded-Host
</IfModule>
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | silverstripe/framework | ≥ 3.1.0&&< 3.1.13 | 3.1.13 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/framework. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update silverstripe/framework to 3.1.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-25gq-jvx2-vg9x 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.
How O3 protects you
O3 pinpoints whether GHSA-25gq-jvx2-vg9x is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-25gq-jvx2-vg9x. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-25gq-jvx2-vg9x in your dependencies?
O3 detects GHSA-25gq-jvx2-vg9x across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.