Quick answers
- Is CVE-2026-84423 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-84423 being exploited in the wild.
- How severe is CVE-2026-84423?
- High severity, with a CVSS score of 7.3, published 1 September 2026.
- Which products and versions are affected?
- Casdoor Casdoor up to 4.0.0.
- Is there a fix for CVE-2026-84423?
- 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-2026-84423 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-84423?
- Check whether anything you run is named in the advisory. 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 a missing authentication check in the upload-resource API endpoint within the controllers/resource.go file of Casdoor up to version 4.0.0. The flaw allows an unauthenticated, network-accessible attacker to directly invoke the resource upload functionality without providing valid credentials. This authentication bypass can be exploited remotely without any user interaction or prior authentication requirements. An attacker can upload arbitrary files to the Casdoor instance, potentially leading to remote code execution, data injection, or system compromise depending on how uploaded files are processed. Patches or mitigations from the vendor are not publicly documented; the vendor reportedly deleted the disclosure issue on GitHub without responding to early disclosure notification.
Affected products
- Casdoor Casdoor up to 4.0.0
Timeline
- 2026-09-01: disclosed
- other: Vendor deleted GitHub issue and did not respond to early disclosure notification