Auth bypass in Casdoor
CVE-2026-84423
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Casdoor — versions 4.0
Weakness classification (CWE)
References
- vuldb.com/vuln/397791 (vdb-entry)
- vuldb.com/vuln/397791/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-84423 (third-party-advisory)
- vuldb.com/submit/883037 (third-party-advisory)
- github.com/casdoor/casdoor/issues/5617 (issue-tracking)
- github.com/geo-chen/oss/blob/main/casdoor.md (exploit)
- github.com/casdoor/casdoor/ (product)
Frequently asked questions
- What is CVE-2026-84423?
- CVE-2026-84423 is a high-severity vulnerability in Casdoor, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-09-01.
- How severe is CVE-2026-84423?
- High severity. CVSS v3 base score is 7.3 out of 10.