Auth bypass in Opencsg Csghub
CVE-2026-120426
OpenCSG CSGHub through v2.6.0-ce contains an authorization bypass vulnerability in the unauthenticated file resolve route that allows remote attackers to read private repository files. Attackers can inject a percent-encoded current_user parameter into the file path, which the portal forwards with its server API key, to read files in private model, code or space repositories.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/OpenCSGs/csghub/issues/1586 (issue-tracking)
- github.com/OpenCSGs/csghub/blob/v2.6.0-ce/internal/routes/router.go (technical-description)
- github.com/OpenCSGs/csghub/blob/v2.6.0-ce/internal/handlers/frontend/resolve.go (technical-description)
- github.com/OpenCSGs/csghub/blob/v2.6.0-ce/pkg/server/backend/csghubserver/downl… (technical-description)
- github.com/OpenCSGs/csghub-server/blob/v2.6.0-ce/api/middleware/authenticator.go (technical-description)
- github.com/OpenCSGs/csghub/releases/tag/v2.6.0-ce (release-notes)
- hackmd.io/@hieund/csghub-private-repo-file-read-idor (technical-description)
- www.vulncheck.com/advisories/opencsg-csghub-through-2.6.0-ce-unauthenticated-pr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120426?
- CVE-2026-120426 is a high-severity vulnerability in Opencsg Csghub, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-11-02.
- How severe is CVE-2026-120426?
- High severity. CVSS v3 base score is 7.5 out of 10.