CVE-2026-55761Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments.
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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.
- CVSS
- 5.9 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-287
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
portainer portainer portainer:portainer | from 2.39.0 before 2.39.4; from 2.40.0 before 2.43.0 | NVD |
References
- https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02bpatch
- https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312patch
- https://github.com/portainer/portainer/issues/2770issue-tracking
- https://github.com/portainer/portainer/releases/tag/2.39.4release-notes
- https://github.com/portainer/portainer/releases/tag/2.43.0release-notes
- https://github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pcexploit, mitigation, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.