Executive brief
Arcane, a management interface for Docker and GitOps workflows, contains a security flaw that allows any logged-in user to steal sensitive Git credentials. By exploiting a lack of administrative checks, a standard user can redirect repository settings to a server they control, forcing the system to send them decrypted access tokens or SSH keys. This could lead to a full compromise of an organization's private source code and automated deployment pipelines.
Technical details
A missing authorization check (CWE-862) exists in Arcane's huma-based REST API. While the authentication middleware validates JWTs, eight endpoints under /api/customize/git-repositories and /api/git-repositories/sync fail to call the checkAdmin(ctx) helper, allowing any authenticated user to perform CRUD operations on Git configurations. An attacker can update an existing repository's URL to a malicious endpoint while omitting the token/sshKey fields; the service layer preserves the existing encrypted credentials during partial updates. When the attacker subsequently triggers a connection test or file browse operation, the application decrypts the legitimate credentials and transmits them as HTTP Basic auth or SSH keys to the attacker's server. This vulnerability is resolved in version 1.19.0.
Affected products
- getarcaneapp Arcane < 1.19.0
Timeline
- 2026-05-11: advisory: Original GitHub Security Advisory published
- 2026-05-29: disclosed: CVE published to NVD