How severe is GHSA-h4cc-fxpp-pgw9?

GHSA-h4cc-fxpp-pgw9 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-h4cc-fxpp-pgw9?

GHSA-h4cc-fxpp-pgw9 affects the following packages: baserproject/basercms (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-h4cc-fxpp-pgw9?

Update baserproject/basercms to 4.7.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h4cc-fxpp-pgw9 is resolved across your whole dependency graph.

How do I detect GHSA-h4cc-fxpp-pgw9 in my Packagist dependencies?

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.

How do I mitigate GHSA-h4cc-fxpp-pgw9 if there is no patch (or I can't update yet)?

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 does O3 Security protect against GHSA-h4cc-fxpp-pgw9?

O3 pinpoints whether GHSA-h4cc-fxpp-pgw9 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-h4cc-fxpp-pgw9 actively exploited in the wild?

No public exploit code has been indexed for GHSA-h4cc-fxpp-pgw9 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-h4cc-fxpp-pgw9?

GHSA-h4cc-fxpp-pgw9 has an EPSS (Exploit Prediction Scoring System) score of 1.5%, placing it in the 72th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-h4cc-fxpp-pgw9?

GHSA-h4cc-fxpp-pgw9 is classified as Unrestricted File Upload (CWE-434). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-h4cc-fxpp-pgw9 published, and has it been updated?

GHSA-h4cc-fxpp-pgw9 was published on March 23, 2023 and was last updated on November 8, 2023. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

GHSA-h4cc-fxpp-pgw9: baserproject/basercms Remote Code Executio…

EPSS Exploitation Probability

via FIRST.org ↗

1.5%probability of exploitation in next 30 days

Lower Risk72th percentile-0.55%

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

1 pkg affected

🐘baserproject/basercms

Real-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

Impact

There is a Remote Code Execution (RCE) Vulnerability on the management system of baserCMS.

Target

baserCMS 4.7.3 and earlier versions

Patches

Update to the latest version of baserCMS

Credits

島峰泰平＠三井物産セキュアディレクション株式会社

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`baserproject/basercms`	all versions	4.7.5

Detection & mitigation playbook

Open-source dependency

Detect
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 4.7.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h4cc-fxpp-pgw9 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-h4cc-fxpp-pgw9 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-h4cc-fxpp-pgw9. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Impact There is a Remote Code Execution (RCE) Vulnerability on the management system of baserCMS. ### Target baserCMS 4.7.3 and earlier versions ### Patches Update to the latest version of baserCMS ### Credits 島峰泰平＠三井物産セキュアディレクション株式会社

O3 Security · Impact-Aware SCA

Is GHSA-h4cc-fxpp-pgw9 in your dependencies?

O3 detects GHSA-h4cc-fxpp-pgw9 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works

GHSA-h4cc-fxpp-pgw9