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

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-01 · updated 2026-09-03
Weakness: CWE-287

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

Casdoor: 4.0

References

https://github.com/casdoor/casdoor/
https://github.com/casdoor/casdoor/issues/5617
https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-1-unauthenticated-arbitrary-file-upload-via-apiupload-resource
https://vuldb.com/cve/CVE-2026-84423
https://vuldb.com/submit/883037
https://vuldb.com/vuln/397791
https://vuldb.com/vuln/397791/cti

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