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CVE-2026-42844— Grav: Low-privileged API users can create super-admin accounts via blueprint-upload

Quick assessment

Affected
getgrav grav
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.

Grav是Grav开源的一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 2.0.0-beta.2版本存在安全漏洞，该漏洞源于低权限认证API用户可滥用/api/v1/blueprint-upload写入任意YAML文件到user/accounts/目录，然后以新创建的具有api.super权限的账户登录，可能导致完全管理权限。

AI Predicted 8.8 Difficulty: Easy EPSS 0.48% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav 2.0.0-beta.2 affected
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I. Basic Information for CVE-2026-42844

Vulnerability Information
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Vulnerability Title
Grav: Low-privileged API users can create super-admin accounts via blueprint-upload
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a file-based Web platform. In Grav 2.0.0-beta.2, a low-privileged authenticated API user with api.media.write can abuse /api/v1/blueprint-upload to write an arbitrary YAML file into user/accounts/, then log in as the newly created account with api.super privileges. This results in full administrative compromise of the Grav API. This vulnerability is fixed in API 1.0.0-beta.17.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是Grav开源的一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 2.0.0-beta.2版本存在安全漏洞，该漏洞源于低权限认证API用户可滥用/api/v1/blueprint-upload写入任意YAML文件到user/accounts/目录，然后以新创建的具有api.super权限的账户登录，可能导致完全管理权限。
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
getgrav grav 2.0.0-beta.2 -

II. Public POCs for CVE-2026-42844

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III. Intelligence Information for CVE-2026-42844

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Vendor Advisories for CVE-2026-42844 (1)

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-434

V. Comments for CVE-2026-42844

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