CVE-2026-55761
Description
Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. In versions 2.39.0 through 2.39.3 and 2.40.0 until 2.43.0, unauthenticated restore and administrator initialization endpoints (/api/restore and /api/users/admin/init) remain accessible during the five-minute setup window for uninitialized instances, allowing a network attacker to restore a crafted backup or create the first administrator account and gain full administrative access. This issue is fixed in versions 2.39.4 and 2.43.0.
How to fix
- portainer portainer2.39.4, 2.43.0 or later
- github.com/portainer/portainer2.39.4, 2.43.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| portainer portainer | 2.39.0 ≤ v < 2.39.4, 2.40.0 ≤ v < 2.43.0 | 2.39.4, 2.43.0 |
| github.com/portainer/portainerGo | 2.39.0 ≤ v < 2.39.4, 2.40.0 ≤ v < 2.43.0, No range specified | 2.39.4, 2.43.0 |
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Attack Surface Management
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