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TI-2026-29036 Aliases CVE-2026-40242GHSA-ff24-4prj-gpmj

Arcane Unauthenticated SSRF with Conditional Response Reflection in Template Fetch Endpoint

Priority HIGH 71CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to 1.17.3, the /api/templates/fetch endpoint accepts a caller-supplied url parameter and performs a server-side HTTP GET request to that URL without authentication and without URL scheme or host validation. The server's response is returned directly to the caller. type. This constitutes an unauthenticated SSRF vulnerability affecting any publicly reachable Arcane instance. This vulnerability is fixed in 1.17.3.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00621 50th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed arcane (getarcaneapp): 1.17.3github.com/getarcaneapp/arcane/backend (Go): 1.17.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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 1.17.31.17.3Patch availableCNA
—github.com/getarcaneapp/arcane/backend (Go)before 1.17.31.17.3Patch availableGHSA-ff24-4prj-gpmj
  • arcane Vendorgetarcaneapp Affected before 1.17.3 Fixed in 1.17.3 Patch available CNA
  • github.com/getarcaneapp/arcane/backend (Go) Vendor— Affected before 1.17.3 Fixed in 1.17.3 Patch available GHSA-ff24-4prj-gpmj

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:getarcane:arcane:*:*:*:*:*:*:*:*before 1.17.3VulnerableGetarcane
  • cpe:2.3:a:getarcane:arcane:*:*:*:*:*:*:*:* Versions before 1.17.3 Vulnerable ·Getarcane

Remediation

  • Fix · CNA arcane (getarcaneapp) Fixed in 1.17.3
  • Fix · GHSA-ff24-4prj-gpmj github.com/getarcaneapp/arcane/backend (Go) Fixed in 1.17.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40242
  2. 2026-10-03 Alias added: GHSA-ff24-4prj-gpmj
  3. 2026-10-25 EPSS moved to the below the 50th percentile
  4. 2026-11-07 EPSS moved to the 50th–90th percentile

References

Exploit 1

Advisory 1

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