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CVE-2026-57856— Cockpit CMS Path Traversal via Bucket Name in Bucket File Storage API

CVSS 8.8 · High EPSS 0.39% · P31

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProductVersion RangeStatus
Cockpit HQCockpit CMS< 2.14.0affected
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I. Basic Information for CVE-2026-57856

Vulnerability Information
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Vulnerability Title
Cockpit CMS Path Traversal via Bucket Name in Bucket File Storage API
Source: NVD (National Vulnerability Database)
Vulnerability Description
Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with preg_replace('/[^a-zA-Z0-9-_\\.]/','', $bucket), which permits '..' and '../' sequences. The sanitized value is interpolated into a Flysystem path as uploads://buckets/{bucket}. Flysystem's WhitespacePathNormalizer resolves 'buckets/..' to the empty string (the uploads storage root) without raising PathTraversalDetected because the '..' has a preceding component to consume. An authenticated low-privileged user can send a crafted request with a '../' bucket name to list, upload, and delete files across all buckets, including those belonging to other users or roles
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cockpit CMS 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cockpit Cockpit CMS是Cockpit组织的内容管理系统。 Cockpit CMS 2.14.0之前版本存在路径遍历漏洞，该漏洞源于Bucket文件存储API中存在路径遍历漏洞，涉及使用preg_replace函数对bucket名称进行清理时允许'..'和'../'序列，可能导致已验证的低权限用户通过发送特制请求列出、上传和删除所有存储桶中的文件。
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

VendorProductAffected VersionsCPESubscribe
Cockpit HQCockpit CMS 0 ~ 2.14.0 -

II. Public POCs for CVE-2026-57856

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7957 chars
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III. Intelligence Information for CVE-2026-57856

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Patches & Fixes for CVE-2026-57856 (1)

Vendor Advisories for CVE-2026-57856 (3)

Vendor Pages for CVE-2026-57856 (1)

IV. Related Vulnerabilities

Same product: Cockpit CMS
Same vendor: Cockpit HQ
Same weakness: CWE-22

V. Comments for CVE-2026-57856

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