GHSA-fw5q-j9p4-3vxg is a high-severity (CVSS 7.7) Cross-site Scripting (XSS) vulnerability in baserproject/basercms. O3 Security confirms whether GHSA-fw5q-j9p4-3vxg is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Blog comment posting, Cross Site Scripting(XSS) Vulnerability in Latest Release 4.4.0
Real-World Exposure
baserproject/basercmsReal-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
baserCMS 4.4.0 and earlier is affected by Cross Site Scripting (XSS).
Impact: XSS via Arbitrary script execution. Components are: Blog comment posting Tested baserCMS Version : 4.4.0 (Latest) Affected baserCMS Version : 4.0.0 ~ 4.4.0 Patches : https://basercms.net/security/20201029 Found by yama
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | baserproject/basercms | ≥ 4.4.0&&< 4.4.1 | 4.4.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for baserproject/basercms. 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 baserproject/basercms to 4.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fw5q-j9p4-3vxg 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-fw5q-j9p4-3vxg 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-fw5q-j9p4-3vxg. 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-fw5q-j9p4-3vxg in your dependencies?
O3 detects GHSA-fw5q-j9p4-3vxg across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.