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CVE-2026-44884— Portainer: Missing authorization on custom template file endpoint exposes template content

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 2.33.0版本至2.33.8之前版本和2.39.1之前版本存在安全漏洞，该漏洞源于自定义模板文件端点缺少授权验证，允许已认证用户通过枚举ID读取任意模板文件内容。

AI Predicted 6.5 Difficulty: Easy EPSS 0.38% · P29

Affected Version Matrix 2

VendorProduct Version RangeStatus
portainer portainer >= 2.33.0, < 2.33.8 affected
>= 2.39.0, < 2.39.1 affected
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I. Basic Information for CVE-2026-44884

Vulnerability Information
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Vulnerability Title
Portainer: Missing authorization on custom template file endpoint exposes template content
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. From 2.33.0 to before 2.33.8 and 2.39.1, a missing authorization vulnerability in the Custom Template file endpoint (GET /api/custom_templates/{id}/file) allows any authenticated user to read the file content of any custom template by enumerating sequential integer IDs, bypassing Resource Control access restrictions. Template files may contain environment-specific values such as connection strings, API tokens, or registry credentials that administrators would not expect standard users to read. This vulnerability is fixed in 2.33.8 and 2.39.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Portainer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Portainer是Portainer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 2.33.0版本至2.33.8之前版本和2.39.1之前版本存在安全漏洞，该漏洞源于自定义模板文件端点缺少授权验证，允许已认证用户通过枚举ID读取任意模板文件内容。
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 >= 2.33.0, < 2.33.8 -

II. Public POCs for CVE-2026-44884

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III. Intelligence Information for CVE-2026-44884

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Vendor Advisories for CVE-2026-44884 (1)

Same Patch Batch · portainer · 2026-05-28 · 9 CVEs total

CVE-2026-44850 8.5 HIGH Portainer: Bind-mount restriction bypass via HostConfig.Mounts
CVE-2026-44882 8.1 HIGH Portainer: Kubernetes middleware continues after token validation failure, bypassing endpo
CVE-2026-44885 5.5 MEDIUM Portainer: Path traversal in backup archive extraction allows arbitrary file write
CVE-2026-33590 Insecure default permissions in Portainer CE
CVE-2026-44881 Portainer: Arbitrary File Read via Git Symlink Injection in Stack Auto-Update
CVE-2026-44848 Portainer: Missing authorization on Docker plugin endpoints allows host RCE
CVE-2026-44883 Portainer: JWT accepted in URL query leaks tokens to logs and referers
CVE-2026-44849 Portainer: Endpoint security bypass via Swarm service create/update

IV. Related Vulnerabilities

Same product: portainer
Same vendor: portainer
Same weakness: CWE-862

V. Comments for CVE-2026-44884

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