Vulnerability Description
Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to version 1.18.0, four GET endpoints under /api/templates* in Arcane's Huma backend are registered without any Security requirement, allowing any unauthenticated network client to list and read the full Compose YAML and .env content of every custom template stored in the instance. Because Arcane's UI exposes a "Save as Template" flow on the project / swarm-stack creation pages that persists the operator's real env content (database passwords, API keys, etc.) verbatim, this missing authorization is an unauthenticated read of operator secrets in practice — not a theoretical info-disclosure. The frontend explicitly treats /customize/templates/* as an authenticated area (PROTECTED_PREFIXES in frontend/src/lib/utils/redirect.util.ts), and every CRUD operation (POST/PUT/DELETE) on the same paths requires a Bearer/API key, so this is a clear backend authorization gap, not intended public access. This issue has been patched in version 1.18.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Getarcane | Arcane | < 1.18.0 |
Related Weaknesses (CWE)
References
- https://github.com/getarcaneapp/arcane/releases/tag/v1.18.0ProductRelease Notes
- https://github.com/getarcaneapp/arcane/security/advisories/GHSA-cxx3-hr75-4q96Vendor Advisory
FAQ
What is CVE-2026-42461?
CVE-2026-42461 is a vulnerability with a CVSS score of 7.5 (HIGH). Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to version 1.18.0, four GET endpoints under /api/templates* in Arcane's Huma backend are registered without ...
How severe is CVE-2026-42461?
CVE-2026-42461 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42461?
Check the references section above for vendor advisories and patch information. Affected products include: Getarcane Arcane.