CVE-2023-35167 is a medium-severity (CVSS 5) CWE-284 vulnerability in remult. O3 Security confirms whether CVE-2023-35167 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
When setting EntityOptions.apiPrefilter to a function, the filter is not applied to API requests for a resource by Id
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
remultnpmDescription
Remult is a CRUD framework for full-stack TypeScript. If you used the apiPrefilter option of the @Entity decorator, by setting it to a function that returns a filter that prevents unauthorized access to data, an attacker who knows the id of an entity instance is not authorized to access, can gain read, update and delete access to it. The issue is fixed in version 0.20.6. As a workaround, set the apiPrefilter option to a filter object instead of a function.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | remult | all versions | 0.20.6 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for remult. 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 remult to 0.20.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-35167 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-2023-35167 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-2023-35167. 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-2023-35167 in your dependencies?
O3 detects CVE-2023-35167 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.