GHSA-8pp6-8x4q-c5mx
HIGHGHSA-8pp6-8x4q-c5mx is a high-severity (CVSS 7.6) Server-Side Request Forgery (SSRF) vulnerability in C1CMS.Assemblies. O3 Security confirms whether GHSA-8pp6-8x4q-c5mx is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Server side request forgery in C1 CMS
Real-World Exposure
C1CMS.AssembliesReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
C1 CMS is an open-source, .NET based Content Management System (CMS). Versions prior to 6.12 allow an authenticated user to exploit Server Side Request Forgery (SSRF) by causing the server to make arbitrary GET requests to other servers in the local network or on localhost. The attacker may also truncate arbitrary files to zero size (effectively delete them) leading to denial of service (DoS) or altering application logic. The authenticated user may unknowingly perform the actions by visiting a specially crafted site. Patched in C1 CMS v6.12, no known workarounds exist.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | C1CMS.Assemblies | all versions | 6.12.8122.18346 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for C1CMS.Assemblies. 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 C1CMS.Assemblies to 6.12.8122.18346 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8pp6-8x4q-c5mx 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-8pp6-8x4q-c5mx 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-8pp6-8x4q-c5mx. 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-8pp6-8x4q-c5mx in your dependencies?
O3 detects GHSA-8pp6-8x4q-c5mx across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.