CVE-2026-42609— Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
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。
Possible ATT&CK Techniques 1 AI
T1136.001 · Local Account
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-42609
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
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
II. Public POCs for CVE-2026-42609
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-42609
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-42609 (1)
Same Patch Batch · getgrav · 2026-05-11 · 13 CVEs total
| CVE-2026-42613 | 9.4 CRITICAL | Grav: Privilege Escalation via Missing Server-Side Validation of groups/access |
| CVE-2026-42607 | 9.1 CRITICAL | Grav: Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Featur |
| CVE-2026-42611 | 8.9 HIGH | Grav: Stored XSS via Tag Injection |
| CVE-2026-42843 | 8.8 HIGH | grav-plugin-api: Grav API Privilege Escalation to Super Admin |
| CVE-2026-42612 | 8.5 HIGH | Grav: Publisher-Level Stored XSS via Unquoted Event Attributes |
| CVE-2026-44738 | 7.7 HIGH | Grav: Twig sandbox allows editor-role users to exfiltrate all plugin secrets via Config::t |
| CVE-2026-42610 | 6.5 MEDIUM | Grav: Sensitive Information Disclosure via Accounts Service Bypass |
| CVE-2026-42842 | 5.4 MEDIUM | grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel |
| CVE-2026-42608 | Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component. | |
| CVE-2026-42845 | Grav: Anonymous Page Content Overwrite via Form File Upload filename Override | |
| CVE-2026-42841 | Grav: Stored XSS via Markdown media attribute() action in Grav CMS | |
| CVE-2026-44737 | grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page |
IV. Related Vulnerabilities
Same product: grav
-
CVE-2026-100670
Grav CMS 2.0.14 through 2.0.24 Privilege Escalation via Blue -
CVE-2026-100671
Grav before 2.0.25 Session Cookie Theft via Twig Sandbox -
CVE-2026-100669
Grav before 2.0.25 Sensitive File Disclosure via Case-Variat -
CVE-2026-100668
Grav before 2.0.25 Sandbox Escape via array Filter -
CVE-2026-100667
grav-plugin-login 3.8.7 through 3.9.6 Two-Factor Authenticat
Same vendor: getgrav
-
CVE-2026-100673
Grav Data Manager before 1.4.5 Stored XSS via item-detail vi -
CVE-2026-100672
grav-plugin-comments before 1.2.11 Unauthenticated Informati -
CVE-2026-100670
Grav CMS 2.0.14 through 2.0.24 Privilege Escalation via Blue -
CVE-2026-100671
Grav before 2.0.25 Session Cookie Theft via Twig Sandbox -
CVE-2026-100669
Grav before 2.0.25 Sensitive File Disclosure via Case-Variat
Same weakness: CWE-269
-
CVE-2026-27872
EasyIO FG -
CVE-2026-59797
Apache HTTP Server: mod_ssl SSLRequire allows .htaccess ap_e -
CVE-2026-95687
WPC Shop as a Customer for WooCommerce <= 2.0.0 - Authentica -
CVE-2026-15989
Super Forms <= 6.3.316 - Unauthenticated Privilege Escalatio -
CVE-2026-19807
ByteCoreStack <= 1.2.3 - Authenticated (Subscriber+) Privile
V. Comments for CVE-2026-42609
No comments yet