GHSA-8pp6-8x4q-c5mx — C1CMS.Assemblies
HIGHGHSA-8pp6-8x4q-c5mx is a high-severity (CVSS 7.6) Server-Side Request Forgery (SSRF) vulnerability in C1CMS.Assemblies. A fix is available for C1CMS.Assemblies — see the affected versions and patch details below.
Server side request forgery in C1 CMS
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-8pp6-8x4q-c5mx.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-8pp6-8x4q-c5mx plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 379,145 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
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 | 6.12.8122.18346dotnet add package C1CMS.Assemblies --version 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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-8pp6-8x4q-c5mx can be triaged on real exposure rather than presence alone.
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 Security finds GHSA-8pp6-8x4q-c5mx across NuGet dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.