# CVE-2026-36726: BookCars arbitrary file deletion via directory traversal in delete-temp-license

Source: https://junglewise.ai/threats/cve-2026-36726-bookcars-arbitrary-file-deletion-via-directory-traversal-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-36726 · Severity: info · CVSS 7.5 · Published 2026-06-09

BookCars, a vehicle rental management system, contains a security flaw that allows anyone on the internet to delete files from the server. By sending a specially crafted web request, an attacker can bypass security restrictions to remove critical system files or application data. This could lead to a total loss of service, data corruption, or the disabling of security features.

Technologies: [BookCars](https://junglewise.ai/threats/technologies/bookcars). Vendors: [BookCars](https://junglewise.ai/threats/vendors/bookcars).

## Quick answers

**Is CVE-2026-36726 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36726 being exploited in the wild.

**How severe is CVE-2026-36726?** Informational severity, with a CVSS score of 7.5, published 9 June 2026.

**Which products and versions are affected?** BookCars <= v8.3.

**Is there a fix for CVE-2026-36726?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-36726 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-36726?** Check whether you run BookCars at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An arbitrary file deletion vulnerability exists in BookCars <= v8.3 due to improper input validation in the /api/delete-temp-license/{file} endpoint. The application uses path.join() to concatenate a user-provided filename with a temporary directory path without sanitizing directory traversal sequences (e.g., '../'). An unauthenticated remote attacker can exploit this by sending a POST request containing URL-encoded traversal characters to delete any file the application process has permissions to access. The vulnerability is located in the deleteTempLicense controller within /backend/src/controllers/userController.ts. No official patch is confirmed, but mitigations include implementing path canonicalization and validating that the resolved path remains within the intended directory.

## Affected products

- BookCars BookCars <= v8.3

## Timeline

- 2026-06-09: disclosed: Initial disclosure and NVD publication

## References

- [https://github.com/CC-T-454455/Vulnerabilities/tree/master/bookcars/vulnerability-11](https://github.com/CC-T-454455/Vulnerabilities/tree/master/bookcars/vulnerability-11)

## Related threats

- [BookCars authentication bypass via forged JWT in social-sign-in](https://junglewise.ai/threats/cve-2026-36727-bookcars-authentication-bypass-via-forged-jwt-in-social-sign-in)
- [BookCars unrestricted file rename in /api/create-user component](https://junglewise.ai/threats/cve-2026-36723-bookcars-unrestricted-file-rename-in-api-create-user-component)
- [BookCars arbitrary file upload in create-license and create-car-image API](https://junglewise.ai/threats/cve-2026-36722-bookcars-arbitrary-file-upload-in-create-license-and-create-car)
- [bookcars authentication bypass via forged JWT in validateAccessToken](https://junglewise.ai/threats/cve-2026-36721-bookcars-authentication-bypass-via-forged-jwt-in)
- [BookCars privilege escalation in update-user endpoint](https://junglewise.ai/threats/cve-2026-36720-bookcars-privilege-escalation-in-update-user-endpoint)