CVE-2026-45627: getarcaneapp Arcane reflected XSS in logo endpoint

CVE-2026-45627 · Severity: high · CVSS 8.2 · Published 2026-05-29

Arcane, a management interface for Docker containers and infrastructure, contains a security flaw that allows an attacker to take over administrator accounts. By tricking a logged-in administrator into clicking a malicious link, an attacker can execute unauthorized commands within the victim's session. This could lead to full control over the organization's Docker hosts, including the ability to access sensitive secrets, modify container images, and create new administrative accounts.

Technologies: github.com/getarcaneapp/arcane/backend (Go). Vendors: Go.

Quick answers

Is CVE-2026-45627 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-45627 being exploited in the wild.
How severe is CVE-2026-45627?
High severity, with a CVSS score of 8.2, published 29 May 2026.
Which products and versions are affected?
github.com/getarcaneapp/arcane/backend (Go) <= 1.18.1, SEMVER:introduced=0,fixed=1.19.0.
Is there a fix for CVE-2026-45627?
Yes. github.com/getarcaneapp/arcane/backend (Go): upgrade to 1.19.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-45627 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-45627?
Check whether you run github.com/getarcaneapp/arcane/backend (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/getarcaneapp/arcane/backend (Go): upgrade to 1.19.0 or later
    go get github.com/getarcaneapp/arcane/backend@v1.19.0

Technical details

A reflected Cross-Site Scripting (XSS) vulnerability exists in the `/api/app-images/logo` endpoint of Arcane due to improper neutralization of the `color` query parameter. The application uses `strings.ReplaceAll` to inject the user-supplied string directly into a `<style>` block within an SVG document. An attacker can break out of the style block and inject a `<script>` element. Because the application lacks a Content Security Policy (CSP) and `X-Content-Type-Options: nosniff`, browsers will execute the script if a victim navigates to the crafted URL. This allows for session riding against authenticated users; an attacker can bypass HttpOnly cookie protections by making same-origin API requests (such as creating a new admin user) via the victim's browser. The issue is fixed in version 1.19.0.

Affected products

  • getarcaneapp Arcane <= 1.18.1

Identifiers

  • CVE-2026-45627
  • GHSA-q2pj-8v84-9mh5
  • GO-2026-5561

Timeline

  • 2026-05-11: advisory: Vendor advisory published on GitHub
  • 2026-05-29: disclosed: CVE published to NVD

References

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