GHSA-c5g6-6xf7-qxp3
MEDIUMUmbraco CMS vulnerable to stored Cross-site Scripting in the "dictionary name" on Dictionary section
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
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
@umbraco-cms/backofficenpmDescription
Impact
This can be leveraged to gain access to higher-privilege endpoints, e.g. if you get a user with admin privileges to run the code, you can potentially elevate all users and grant them admin privileges or access protected content.
Patches
Will be patched in 14.3.1 and 15.0.0.
Workarounds
Ensure that access to the Dictionary section is only granted to trusted users.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @umbraco-cms/backoffice | ≥ 14.0.0&&< 14.3.1 | 14.3.1 |
| .NETNuGet | Umbraco.Cms.StaticAssets | ≥ 14.0.0&&< 14.3.1 | 14.3.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @umbraco-cms/backoffice. 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/backoffice to 14.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c5g6-6xf7-qxp3 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-c5g6-6xf7-qxp3 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-c5g6-6xf7-qxp3. 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-c5g6-6xf7-qxp3 in your dependencies?
O3 detects GHSA-c5g6-6xf7-qxp3 across npm, NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.