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Advisory record · GHSA-ff24-4prj-gpmj

Arcane has Unauthenticated SSRF with Conditional Response Reflection in Template Fetch Endpoint

CVSS 7.2 HighEPSS 0.0062 · 50th percentile

Published by the GitHub Advisory Database at 10 Apr 2026, 20:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/getarcaneapp/arcane/backendGo<1.17.31.17.3
Identifiers
GHSA-ff24-4prj-gpmj · CVE-2026-40242 · GO-2026-5356
Weakness (CWE)
CWE-918
Tags
Published
10 Apr 2026
Updated
21 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Arcane's backend Go module (github.com/getarcaneapp/arcane/backend) before 1.17.3 has a server-side request forgery flaw in its /api/templates/fetch endpoint. An unauthenticated attacker can make the server fetch any URL they supply and receive responses or error details back, which allows scanning internal networks and reaching internal HTTP services. Upgrade to version 1.17.3 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.2 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0062, the 50th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:05 UTC First seen by agentprime
  2. 31 Oct 2026, 15:05 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.