OpenCSG CSGHub through v2.6.0-ce Unauthenticated Private Repository File Read via Resolve Route

Summary

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.

Remediation

1. Inventory every OpenCSG CSGHub deployment, including staging.
2. No fixed version appears in the public sources yet. Check the references below and the vendor directly.

References

• Advisoryhttps://www.vulncheck.com/advisories/opencsg-csghub-through-2.6.0-ce-unauthenticated-private-repository-file-read-via-resolve-route
• Referencehttps://github.com/OpenCSGs/csghub-server/blob/v2.6.0-ce/api/middleware/authenticator.go#L210-L226
• Referencehttps://github.com/OpenCSGs/csghub/blob/v2.6.0-ce/internal/handlers/frontend/resolve.go#L138-L151
• Referencehttps://github.com/OpenCSGs/csghub/blob/v2.6.0-ce/internal/routes/router.go#L302-L303
• Referencehttps://github.com/OpenCSGs/csghub/blob/v2.6.0-ce/pkg/server/backend/csghubserver/download.go#L10-L41
• Referencehttps://github.com/OpenCSGs/csghub/issues/1586
• Referencehttps://github.com/OpenCSGs/csghub/releases/tag/v2.6.0-ce
• Referencehttps://hackmd.io/@hieund/csghub-private-repo-file-read-idor