CVE-2026-55761
Published:July 08, 2026
Updated:August 04, 2026
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.
Affected Packages
https://github.com/portainer/portainer.git (GITHUB):
Affected version(s) >=2.39.0 <2.39.4Fix Suggestion:
Update to version 2.39.4https://github.com/portainer/portainer.git (GITHUB):
Affected version(s) >=2.40.0 <2.43.0Fix Suggestion:
Update to version 2.43.0github.com/portainer/portainer (GO):
Affected version(s) >=v0.6.1-0.20260225205219-0f99e298f325 <v0.6.1-0.20260625011741-90a3374c2e8eFix Suggestion:
Update to version v0.6.1-0.20260625011741-90a3374c2e8eRelated Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
5.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Authentication
EPSS
Base Score:
0.29