GHSA-h8wc-r4jh-mg7m
HIGHUmbraco allows possible Admin-level access to backoffice without Auth under rare conditions
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.
Blast Radius
Umbraco.Cms.Infrastructure.NETUmbraco.Cms.Infrastructure.NETUmbraco.Cms.Infrastructure.NETUmbraco.Cms.Web.BackOffice.NETUmbraco.Cms.Web.BackOffice.NETUmbraco.Cms.Web.BackOfficeReal-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
Under rare conditions, a restart of Umbraco can allow unauthorized users to gain admin-level permissions.
Impact
An unauthorized user gaining admin-level access and permissions to the backoffice.
Patches
10.6.1, 11.4.2, 12.0.1
Workarounds
- Enabling the Unattended Install feature will mean the vulnerability is not exploitable.
- Enabling IP restrictions to
*/install/*and*/umbraco/*will limit the exposure to allowed IP addresses.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Umbraco.Cms.Infrastructure | ≥ 9.0.0&&< 10.6.1 | 10.6.1 |
| .NETNuGet | Umbraco.Cms.Infrastructure | ≥ 11.0.0&&< 11.4.2 | 11.4.2 |
| .NETNuGet | Umbraco.Cms.Infrastructure | ≥ 12.0.0&&< 12.0.1 | 12.0.1 |
| .NETNuGet | Umbraco.Cms.Web.BackOffice | ≥ 9.0.0&&< 10.6.1 | 10.6.1 |
| .NETNuGet | Umbraco.Cms.Web.BackOffice | ≥ 11.0.0&&< 11.4.2 | 11.4.2 |
| .NETNuGet | Umbraco.Cms.Web.BackOffice | ≥ 12.0.0&&< 12.0.1 | 12.0.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Umbraco.Cms.Infrastructure. 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 Umbraco.Cms.Infrastructure to 10.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h8wc-r4jh-mg7m 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-h8wc-r4jh-mg7m 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-h8wc-r4jh-mg7m. 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-h8wc-r4jh-mg7m in your dependencies?
O3 detects GHSA-h8wc-r4jh-mg7m across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.