GHSA-48p3-xfvw-g59c is a medium-severity (CVSS 5.3) Improper Authentication vulnerability in impresscms/impresscms. 4 public exploit references exist, so weaponization risk is real. O3 Security confirms whether GHSA-48p3-xfvw-g59c is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Incorrect Access Control in ImpressCMS
Real-World Exposure
impresscms/impresscmsReal-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
ImpressCMS before 1.4.3 has Incorrect Access Control because include/findusers.php allows access by unauthenticated attackers (who are, by design, able to have a security token).
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | impresscms/impresscms | all versions | 1.4.3 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
ImpressCMS before 1.4.3 has Incorrect Access Control because include/fin…
ImpressCMS before 1.4.3 has Incorrect Access Control because include/fin…
ImpressCMS before 1.4.3 has Incorrect Access Control because include/fin…
ImpressCMS before 1.4.3 has Incorrect Access Control because include/fin…
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for impresscms/impresscms. 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 impresscms/impresscms to 1.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-48p3-xfvw-g59c 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-48p3-xfvw-g59c 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-48p3-xfvw-g59c. 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-48p3-xfvw-g59c in your dependencies?
O3 detects GHSA-48p3-xfvw-g59c across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.