Quick answers
- Is CVE-2026-75339 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-75339 being exploited in the wild.
- How severe is CVE-2026-75339?
- High severity, with a CVSS score of 8.8, published 28 August 2026.
- Which products and versions are affected?
- Cjbi Admin3 v3.0.0.
- Is there a fix for CVE-2026-75339?
- 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-2026-75339 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-75339?
- Check whether you run Cjbi Admin3 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
The vulnerability is an authorization bypass in the file storage endpoints (/storage/upload, /storage/fetch/**, /storage/download/**) of cjbi admin3 v3.0.0. The POST /storage/upload endpoint lacks the @RequiresPermissions annotation that protects other storage endpoints, allowing any authenticated user—even those with zero permissions—to upload files. Additionally, the login interceptor explicitly whitelists fetch and download paths, making them accessible without authentication. The DELETE /storage/files/{key} endpoint also lacks permission checks. Attackers can upload malicious files and any anonymous user can retrieve them using enumerable keys (5-char-random prefix + filename pattern), leading to storage abuse and data disclosure. The vulnerability requires either a valid login token (for upload/delete) or no authentication (for download).
Affected products
- cjbi admin3 v3.0.0
Timeline
- 2026-08-28: disclosed