Missing Authentication in Casdoor Upload-Resource API
CVE-2026-84423

6.9MEDIUM

Key Information:

Vendor

Casdoor

Status
Casdoor
Vendor
CVE Published:
1 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-84423?

A vulnerability exists in the Casdoor Upload-Resource API located within the resource.go file, specifically affecting versions up to 4.0.0. This issue can result in missing authentication, allowing for unauthorized access and manipulation of resources. The vulnerability can be exploited remotely, posing a significant risk to users. Despite public disclosure of the exploit, the vendor has not provided clarification on the issue and has removed the related GitHub discussion without eliciting a response.

Affected Version(s)

Casdoor 4.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-84423 - Proof of Concept

References

https://vuldb.com/vuln/397791
vdb-entry
https://vuldb.com/vuln/397791/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-84423
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

geochen (VulDB User)
VulDB CNA Team
.