GHSA-xx95-62h6-h7v3
lgsl Stored Cross-Site Scripting vulnerability
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
tltneon/lgslReal-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
A stored cross-site scripting (XSS) vulnerability was identified in lgsl. The issue arises from improper sanitation of user input. Everyone who accesses this page will be affected by this attack.
Details
The function lgsl_query_40 in lgsl_protocol.php has implemented an HTTP crawler. This function makes a request to the registered game server, and upon crawling the malicious /info endpoint with our payload, will render our javascript on the info page. This information is being displayed via lgsl_details.php
Affected Code:
foreach ($server['e'] as $field => $value) {
$value = preg_replace('/((https*:\/\/|https*:\/\/www\.|www\.)[\w\d\.\-\/=$?]*)/i', "<a href='$1' target='_blank'>$1</a>", html_entity_decode($value));
$output .= "
<tr><td> {$field} </td><td> {$value} </td></tr>";
}
PoC
-
Create a game server with type
ecoand set the target host and port accordingly to your ttack server. I have crafted this json payload that is being parsed according to the schema and being served on/info -
Serve the following JSON payload at
/infoon your handler
{
"Animals": "1",
"EconomyDesc": "<img src=x onerror=prompt(1)>"
}
- Access the corresponding server info page at
/s?=. Upon refreshing & crawling our server, it should execute our javascript.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | tltneon/lgsl | all versions | 7.0.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tltneon/lgsl. 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 tltneon/lgsl to 7.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xx95-62h6-h7v3 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-xx95-62h6-h7v3 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-xx95-62h6-h7v3. 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-xx95-62h6-h7v3 in your dependencies?
O3 detects GHSA-xx95-62h6-h7v3 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.