GHSA-4m5r-w2rq-q54q
HIGHLibreNMS has a Persistent XSS from Insecure Input Sanitization Affects Multiple Endpoints
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
librenms/librenmsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Summary
The application fail to sanitising inputs properly and rendering the code from user input to browser which allow an attacker to execute malicious javascript code.
Details
User with Admin role can edit the Display Name of a device, the application did not properly sanitize the user input in the device Display Name, if java script code is inside the name of the device Display Name, its can be trigger from different sources.
PoC
- Use an Admin role user to change the Display Name of a device into the payload
<img src="x" onerror="alert(document.cookie)">
2.1. Go to manage user and choose Manage Access
2.2. A pop-up will show
3.1. Create a new Alert Rule where it will check if the device is up or down by using ICMP and then add the rule to the device.
3.2. Once the device is down, there will be an alert in the Alerts Notifications
3.3. Hover over the Hostname will see a pop-up.
4.1. The same can be trigger in the Alert History once hover over the Device field.
5.1. The same can be trigger once hover over the Hostname field from the Event Log of the device.
6.1. The same can be trigger in the Outages function in the Logs of the device.
7.1. In the Active Alerts of the device.
8.2. In the Alert History of the device.
9.1. They can also be trigger in the dashboard.
10.1. Also if change the payload into <img src="x" onerror="alert(document['cookie'])">, it can also be trigger in the Availability Map.
Impact
It could allow authenticated users to execute arbitrary JavaScript code in the context of other users' sessions. Impacted users could have their accounts compromised, enabling the attacker to perform unauthorized actions on their behalf.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | librenms/librenms | all versions | 24.10.0 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for librenms/librenms. 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 librenms/librenms to 24.10.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4m5r-w2rq-q54q 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-4m5r-w2rq-q54q 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-4m5r-w2rq-q54q. 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-4m5r-w2rq-q54q in your dependencies?
O3 detects GHSA-4m5r-w2rq-q54q across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.