CVE-2026-42844— Grav: Low-privileged API users can create super-admin accounts via blueprint-upload
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
危险类型文件的不加限制上传
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-42844
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- https://github.com/getgrav/grav/security/advisories/GHSA-6xx2-m8wv-756hx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42844
IV. Related Vulnerabilities
Same product: grav
- CVE-2026-44738
Grav: Twig sandbox allows editor-role users to exfiltrate al - CVE-2026-42842
grav-plugin-form: XSS via Taxonomy Field Values in Admin Pan - CVE-2026-42613
Grav: Privilege Escalation via Missing Server-Side Validatio - CVE-2026-42612
Grav: Publisher-Level Stored XSS via Unquoted Event Attribut - CVE-2026-42611
Grav: Stored XSS via Tag Injection
Same vendor: getgrav
- CVE-2026-42843
grav-plugin-api: Grav API Privilege Escalation to Super Admi - CVE-2026-44737
grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflect - CVE-2026-44738
Grav: Twig sandbox allows editor-role users to exfiltrate al - CVE-2026-42845
Grav: Anonymous Page Content Overwrite via Form File Upload - CVE-2026-42842
grav-plugin-form: XSS via Taxonomy Field Values in Admin Pan
Same weakness: CWE-434
- CVE-2021-47965
WordPress Plugin WP Super Edit 2.5.4 Unrestricted File Uploa - CVE-2026-44088
Remote Code Execution in SzafirHost - CVE-2026-22707
Strapi Upload Plugin MIME Validation Bypass via Content API - CVE-2026-41937
Vvveb < 1.0.8.3 Unrestricted File Upload RCE via Plugin Uplo - CVE-2026-6271
Career Section <= 1.7 - Unauthenticated Arbitrary File Uplo
V. Comments for CVE-2026-42844
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