CVSS 4.0
7.1 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:HCVE-2026-55761
High (7.1) in portainer portainer. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in github.com/portainer/portainer 2.39.4, 2.43.0.
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.
Severity
CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
- CWE
- CWE-287
- Published
- Modified
- Record from
- the NVD, synced
Affected
- portainer:portainer
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-x626-fcwx-f5pc | Go | github.com/portainer/portainer | >=2.39.0 <2.39.4 | 2.39.4 |
| GHSA-x626-fcwx-f5pc | Go | github.com/portainer/portainer | >=2.40.0 <2.43.0 | 2.43.0 |
| GO-2026-6324 | Go | github.com/portainer/portainer | all versions | no fix published |
References
- https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b
- https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312
- https://github.com/portainer/portainer/issues/2770
- https://github.com/portainer/portainer/releases/tag/2.39.4
- https://github.com/portainer/portainer/releases/tag/2.43.0