Executive brief
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.
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
Timeline
- 2026-05-11: advisory: Vendor advisory published on GitHub
- 2026-05-29: disclosed: CVE published to NVD