CVE-2026-55761

UNKNOWN 0.0

Portainer: Unauthenticated Restore Endpoint Allows Admin Takeover on Uninitialised Portainer Instances

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-287
Vendor	portainer
Product	portainer
Published	Jul 8, 2026
Last Updated	Jul 8, 2026

Stay Ahead of the Next One

Get instant alerts for portainer portainer

Be the first to know when new unknown vulnerabilities affecting portainer portainer are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

portainer / portainer

>= 2.39.0, < 2.39.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pc github.com: https://github.com/portainer/portainer/issues/2770 github.com: https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b github.com: https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312 github.com: https://github.com/portainer/portainer/releases/tag/2.39.4 github.com: https://github.com/portainer/portainer/releases/tag/2.43.0