CVE-2026-40242CWE-918

Arcane Unauthenticated SSRF with Conditional Response Reflection in Template Fetch Endpoint

High · published April 10, 2026

CVSS v3.1
7.2
EPSS
1%
Percentile
53.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00721 · 53.4th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-04-10T20:34Z
EPSS history
Timeline
  • 10 APR 20:34Z
    Arcane Unauthenticated SSRF with Conditional Response Reflection in Template Fetch Endpoint
    cvelistv5