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CVE-2026-55761— Portainer: Unauthenticated Restore Endpoint Allows Admin Takeover on Uninitialised Portainer Instances

Quick assessment

Affected
portainer portainer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Portainer是Portainer公司开源的一款用于管理Docker环境和Docker主机的轻量级用户管理界面。 Portainer 2.39.0及之前版本、2.39.3及之前版本和2.40.0至2.43.0之前版本存在授权问题漏洞，该漏洞源于/api/restore和/api/users/admin/init端点访问控制问题，可能导致网络攻击者恢复特制备份或创建管理员账户，获得完全管理访问权限。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
portainer portainer >= 2.39.0, < 2.39.4 affected
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I. Basic Information for CVE-2026-55761

Vulnerability Information
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Vulnerability Title
Portainer: Unauthenticated Restore Endpoint Allows Admin Takeover on Uninitialised Portainer Instances
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Portainer 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Portainer是Portainer公司开源的一款用于管理Docker环境和Docker主机的轻量级用户管理界面。 Portainer 2.39.0及之前版本、2.39.3及之前版本和2.40.0至2.43.0之前版本存在授权问题漏洞，该漏洞源于/api/restore和/api/users/admin/init端点访问控制问题，可能导致网络攻击者恢复特制备份或创建管理员账户，获得完全管理访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
portainer portainer >= 2.39.0, < 2.39.4 -

II. Public POCs for CVE-2026-55761

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III. Intelligence Information for CVE-2026-55761

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Vendor Advisories for CVE-2026-55761 (1)

Proof of Concept for CVE-2026-55761 (1)

Vendor Pages for CVE-2026-55761 (2)

IV. Related Vulnerabilities

Same product: portainer
Same vendor: portainer
Same weakness: CWE-287

V. Comments for CVE-2026-55761

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