CVE-2021-23814
HIGHCVE-2021-23814 is a high-severity (CVSS 8.8) Code Injection vulnerability in unisharp/laravel-filemanager. O3 Security confirms whether CVE-2021-23814 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Unrestricted Upload of File with Dangerous Type in unisharp/laravel-filemanager
Real-World Exposure
unisharp/laravel-filemanagerReal-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
This affects versions of the package unisharp/laravel-filemanager before 2.6.2. The upload() function does not sufficiently validate the file type when uploading.
An attacker may be able to reproduce the following steps:
- Install a package with a web Laravel application.
- Navigate to the Upload window
- Upload an image file, then capture the request
- Edit the request contents with a malicious file (webshell)
- Enter the path of file uploaded on URL - Remote Code Execution
Note: Prevention for bad extensions can be done by using a whitelist in the config file(lfm.php). Corresponding document can be found in here.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | unisharp/laravel-filemanager | all versions | 2.6.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for unisharp/laravel-filemanager. 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 unisharp/laravel-filemanager to 2.6.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-23814 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 CVE-2021-23814 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 CVE-2021-23814. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2021-23814 in your dependencies?
O3 detects CVE-2021-23814 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.