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CVE-2026-42609— Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic

CVSS 8.1 · High EPSS 0.04% · P11

Possible ATT&CK Techniques 1AI

T1136.001 · Local Account

Affected Version Matrix 1

VendorProductVersion RangeStatus
getgravgrav< 2.0.0-beta.2affected
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I. Basic Information for CVE-2026-42609

Vulnerability Information
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Vulnerability Title
Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
Source: NVD (National Vulnerability Database)
Vulnerability Description
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
特权管理不恰当
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之前版本存在安全漏洞，该漏洞源于Grav管理面板中的业务逻辑漏洞，可能导致低权限用户通过创建已存在的用户名覆盖现有账户，包括主管理员，进而导致管理功能拒绝服务和根账户权限降级。
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
getgravgrav < 2.0.0-beta.2 -

II. Public POCs for CVE-2026-42609

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III. Intelligence Information for CVE-2026-42609

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Same Patch Batch · getgrav · 2026-05-11 · 13 CVEs total

CVE-2026-426139.4 CRITICALGrav: Privilege Escalation via Missing Server-Side Validation of groups/access
CVE-2026-426079.1 CRITICALGrav: Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Featur
CVE-2026-426118.9 HIGHGrav: Stored XSS via Tag Injection
CVE-2026-428438.8 HIGHgrav-plugin-api: Grav API Privilege Escalation to Super Admin
CVE-2026-426128.5 HIGHGrav: Publisher-Level Stored XSS via Unquoted Event Attributes
CVE-2026-447387.7 HIGHGrav: Twig sandbox allows editor-role users to exfiltrate all plugin secrets via Config::t
CVE-2026-426106.5 MEDIUMGrav: Sensitive Information Disclosure via Accounts Service Bypass
CVE-2026-428425.4 MEDIUMgrav-plugin-form: XSS via Taxonomy Field Values in Admin Panel
CVE-2026-42608Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component.
CVE-2026-42845Grav: Anonymous Page Content Overwrite via Form File Upload filename Override
CVE-2026-42841Grav: Stored XSS via Markdown media attribute() action in Grav CMS
CVE-2026-44737grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-269

V. Comments for CVE-2026-42609

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