CVE-2026-40076
CVE-2026-40076 is a remote code execution vulnerability in org.openmrs.web:openmrs-web. O3 Security confirms whether CVE-2026-40076 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
OpenMRS Core arbitrary file write and code execution via Zip Slip in module upload
Real-World Exposure
org.openmrs.web:openmrs-web☕org.openmrs.web:openmrs-webReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
OpenMRS Core is an open source electronic medical record system platform. In versions 2.7.8 and earlier and versions 2.8.0 through 2.8.5, the module upload endpoint at POST /openmrs/ws/rest/v1/module is vulnerable to a Zip Slip path traversal attack. During automatic extraction of uploaded .omod archives in WebModuleUtil.startModule(), ZIP entries under web/module/ are checked only to see whether the full entry path starts with .., and the remaining path is then concatenated into the destination path without normalization or a boundary check. A crafted archive can therefore include entries such as web/module/../../../../malicious.jsp and cause files to be written outside the intended module directory.
An authenticated attacker with module upload access can write arbitrary files to locations such as the web application root and achieve remote code execution by uploading a JSP file and then requesting it. The issue is compounded by the fact that the module.allow_web_admin runtime property is enforced in the legacy UI controller but not in the REST API upload path, so deployments relying on that property to block web-based module administration remain exposed through the REST endpoint. This issue has been fixed in versions after 2.7.8 in the 2.7.x line and in version 2.8.6 and later.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.openmrs.web:openmrs-web | all versions | No fix |
| ☕Maven | org.openmrs.web:openmrs-web | ≥ 2.8.0 | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.openmrs.web:openmrs-web. 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.
Remediation status
No patched version of org.openmrs.web:openmrs-web has shipped for CVE-2026-40076 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
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-2026-40076 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-2026-40076. 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-2026-40076 in your dependencies?
O3 detects CVE-2026-40076 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.