Vulnerability · Published Sep 1, 2026 · Assigned by VulDB

CVE-2026-84423Casdoor upload-resource API resource.go missing authentication

High 7.3

In plain English

A high-severity missing authentication in Casdoor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.7%top 46.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability has been found in Casdoor up to 4.0.0. This affects an unknown function of the file controllers/resource.go of the component upload-resource API. Such manipulation leads to missing authentication. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor deleted the GitHub issue for this vulnerability without any explanation. Afterwards the vendor was contacted early about this disclosure via email but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
n/a	Casdoor	4.0

Weakness: CWE-306, CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References

VDB-397791 | Casdoor upload-resource API resource.go missing authentication vdb-entry
VDB-397791 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-84423 | CVE Analysis and Report third-party-advisory
Submit #883037 | casdoor commit 0585ecf Missing Authorization third-party-advisory
https://github.com/casdoor/casdoor/issues/5617 issue-tracking
https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-1-unauthenticated-arbitrary-file-upload-via-apiupload-resource exploit
https://github.com/casdoor/casdoor/ product