GHSA-4gr7-qw2q-jxh6 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in com.alibaba.nacos:nacos-common. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-4gr7-qw2q-jxh6 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Cross-site Scripting in Nacos
Real-World Exposure
com.alibaba.nacos:nacos-common☕com.alibaba.nacos:nacos-commonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
A Cross Site Scripting (XSS) vulnerability exists in Nacos prior to 1.4.5 and 2.1.0-BETA in auth/users via the (1) pageSize and (2) pageNo parameters.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.alibaba.nacos:nacos-common | ≥ 2.0.0-ALPHA.1&&< 2.1.0-BETA | 2.1.0-BETA |
| ☕Maven | com.alibaba.nacos:nacos-common | all versions | 1.4.5 |
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 com.alibaba.nacos:nacos-common. 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 com.alibaba.nacos:nacos-common to 2.1.0-BETA or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4gr7-qw2q-jxh6 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-4gr7-qw2q-jxh6 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-4gr7-qw2q-jxh6. 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-4gr7-qw2q-jxh6 in your dependencies?
O3 detects GHSA-4gr7-qw2q-jxh6 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.