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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/portainer/portainerGo | >= 2.39.0, < 2.39.4 | 2.39.4 |
github.com/portainer/portainerGo | >= 2.40.0, < 2.43.0 | 2.43.0 |
Affected products
3- osv-coordsRange: < 0.0.20260902T191204-160000.1.1
Patches
Vulnerability mechanics
References
8- github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02bnvdPatchWEB
- github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312nvdPatchWEB
- github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pcnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-x626-fcwx-f5pcghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-55761ghsaADVISORY
- github.com/portainer/portainer/issues/2770nvdIssue TrackingWEB
- github.com/portainer/portainer/releases/tag/2.39.4nvdRelease NotesWEB
- github.com/portainer/portainer/releases/tag/2.43.0nvdRelease NotesWEB
News mentions
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