CVE-2021-26814
HIGHCVE-2021-26814 is a high-severity (CVSS 8.8) Path Traversal vulnerability in wazuh. 2 public exploit references exist, so weaponization risk is real. O3 Security confirms whether CVE-2021-26814 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Improper Input Validation (RCE)
Real-World Exposure
wazuhReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
Wazuh API in Wazuh from 4.0.0 to 4.0.3 allows authenticated users to execute arbitrary code with administrative privileges via /manager/files URI. An authenticated user to the service may exploit incomplete input validation on the /manager/files API to inject arbitrary code within the API service script.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | wazuh | ≥ 4.0.0&&< 4.0.4 | 4.0.4 |
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 wazuh. 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 wazuh to 4.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-26814 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-2021-26814 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-2021-26814. 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-2021-26814 in your dependencies?
O3 detects CVE-2021-26814 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.