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TI-2026-30749 Aliases CVE-2026-42461GHSA-cxx3-hr75-4q96

Arcane Vulnerable to Unauthenticated Disclosure of Custom Compose Template Content (incl. `.env` secrets)

Priority MEDIUM 46CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01283 70th percentileScored 2026-11-07
Fix Fixed arcane (getarcaneapp): 1.18.0github.com/getarcaneapp/arcane/backend (Go): 1.18.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getarcaneapparcanebefore 1.18.01.18.0Patch availableCNA
—github.com/getarcaneapp/arcane/backend (Go)before 1.18.01.18.0Patch availableGHSA-cxx3-hr75-4q96
  • arcane Vendorgetarcaneapp Affected before 1.18.0 Fixed in 1.18.0 Patch available CNA
  • github.com/getarcaneapp/arcane/backend (Go) Vendor— Affected before 1.18.0 Fixed in 1.18.0 Patch available GHSA-cxx3-hr75-4q96

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:getarcane:arcane:*:*:*:*:*:*:*:*before 1.18.0VulnerableGetarcane
  • cpe:2.3:a:getarcane:arcane:*:*:*:*:*:*:*:* Versions before 1.18.0 Vulnerable ·Getarcane

Remediation

  • Fix · CNA arcane (getarcaneapp) Fixed in 1.18.0
  • Fix · GHSA-cxx3-hr75-4q96 github.com/getarcaneapp/arcane/backend (Go) Fixed in 1.18.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42461
  2. 2026-10-03 Alias added: GHSA-cxx3-hr75-4q96

References

Advisory 2

Other 2

  • TI-2026-33369 Missing authorization in getarcaneapp arcane CVSS 3.1CRITICAL 9.9
  • TI-2026-75557 Arcane users with delegated permission can take over admin accounts CVSS 3.1HIGH 8.8
  • TI-2026-34717 Arcane: Missing admin authorization on global variables endpoint CVSS 3.1HIGH 8.8
  • TI-2026-75556 Credential exfiltration in Arcane via registry URL repointing CVSS 3.1HIGH 8.5
  • TI-2026-33371 Arcane: Unauthenticated reflected XSS via SVG color parameter in /api/app-images/logo enables admin account takeover CVSS 3.1HIGH 8.2
  • TI-2026-34768 Arcane: Authenticated Arbitrary Host File Read via Docker Compose Include Directives in Arcane CVSS 3.1HIGH 7.7
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences