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CVE-2026-55761GHSA-X626-FCWX-F5PCGO-2026-6324

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 2.39.4, 2.43.0
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • portainer portainer

    From 2.39.0 · fixed in 2.39.4

  • github.com/portainer/portainerGo

    From 2.39.0 · fixed in 2.39.4

  • github.com/portainer/portainerGo

    From 2.40.0 · fixed in 2.43.0

  • github.com/portainer/portainerGo

    All versions

References 6

GitHub · portainer/portainer