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Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover

  • Publicada: 02.12.2025
  • Actualizado: 11.10.2026 10:22

Summary

A privilege escalation vulnerability exists in Grav’s Admin plugin due to the absence of username uniqueness validation when creating users. A user with the create user permission can create a new account using the same username as an existing administrator account, set a new password/email, and then log in as that administrator. This effectively allows privilege escalation from limited user-manager permissions to full administrator access.

Steps to Reproduce

  1. Make sure you have two accounts: an admin and a user with create user privilege
  2. In the user account, navigate to /grav-admin/admin/accounts/users and click "Add"
  3. Enter the name of the admin, complete registration and observe that the existing admin’s email is changed to the value you provided.
  4. Log out from user account log in as admin with new credentials

Impact

  1. Full admin takeover by any user with create user permission.
  2. Ability to change admin credentials, install/remove plugins, read or modify site data, and execute any action available to an admin.
  3. Severity: High/Critical.

PoC

https://github.com/user-attachments/assets/3ab0a7d6-5055-41be-9e0e-2bd6ca359b37

Software afectado

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PlataformaPaqueteVersiones vulnerablesCorregida en
Paquete de Composer getgrav/grav < 1.8.0-beta.27 1.8.0-beta.27

Referencias

Puntuación CVSS 8.8/10
Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Debilidad (CWE)
CWE-266
Plataforma
Composer
Paquete
getgrav/grav
Publicada
02.12.2025
Actualizado
11.10.2026 10:22

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-cjcp-qxvg-4rjm - CC BY 4.0

Historial de vulnerabilidades: getgrav/grav

Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Todas (99) en el archivo
Entradas en total
99
Primera → última
11.2019 09.2026
Sin corrección
6
Explotada en ataques
0

Distribución por gravedad

  • Crítica 7
  • Alta 47
  • Media 41
  • Baja 4

Divulgaciones por año

Gravedad:
  1. Grav CMS vulnerable to remote code execution via .zip file upload
    Alta · 8.8 CVE-2026-72819 < 2.0.13 2.0.13
  2. Grav: Missing admin.super guard on core group blueprint access field allows admin.users operator to escalate to super-admin
    Alta · 9.1 CVE-2026-75837 < 2.0.14 2.0.14
  3. Grav: Blueprint dynamic-data bare-function branch is denylist-gated and omits error_log, giving arbitrary file write
    Crítica · 8.8 CVE-2026-75827 < 2.0.15 2.0.15
  4. Grav: detectXss() misses an event-handler attribute after an unpaired quote in an unquoted attribute value, giving stored XSS
    Crítica · 8.7 CVE-2026-75828 < 2.0.15 2.0.15
  5. Grav: Unauthenticated Path Traversal via Missing Directory-Boundary Check in `plugin-asset-map.php` Static Asset Server (`index.php`)
    Alta · 5.9 CVE-2026-74907 < 2.0.15 2.0.15
  6. Grav: Path Traversal in MediaUploadTrait::deleteFile() Allows Arbitrary File Deletion
    Alta · 8.1 CVE-2026-72695 < 2.0.16 2.0.16
  7. Grav: media_directory() Twig function allows filesystem path traversal and file content disclosure from sandboxed page content
    Alta · 6.5 CVE-2026-72697 < 2.0.16 2.0.16
  8. Grav: UserInterface offsetget/offsetexists allow-listed in Twig sandbox let editor-authored content leak hashed_password and 2FA secrets via offsetGet()
    Alta · 7.7 CVE-2026-76839 < 2.0.16 2.0.16
  9. Grav: config_denied_paths default list omits `system`, exposing real secrets (e.g. system.cache.redis.password) via the Twig sandbox when config_access is enabled
    Alta · 7.5 CVE-2026-76846 < 2.0.16 2.0.16
  10. Grav: The system, site, and theme Twig variables bypass the content sandbox entirely and are never covered by config_denied_paths
    Alta · 6.5 CVE-2026-72698 < 2.0.16 2.0.16
  11. Grav: Path Traversal in ImageMedium::watermark() — arbitrary file disclosure via publicly-cached images
    Alta CVE-2026-69089 >= 2.0.10, < 2.0.11 2.0.11
  12. Grav: Incomplete callable validation in blueprint dynamic fields allows arbitrary static method invocation and file disclosure
    Alta · 8.1 CVE-2026-69088 >= 2.0.7, < 2.0.11 2.0.11
  13. Grav: FlexDirectory::dynamicDataField() executes arbitrary callables from blueprint data with no validation
    Alta · 8.8 CVE-2026-65608 >= 1.7.0, < 2.0.9 2.0.9
  14. Grav: 2FA Bypass via 'login.regenerate2FASecret' - Secret Rotation During Pending Challenge
    Alta · 7.4 CVE-2026-62232 < 2.0.4 2.0.4
  15. Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()
    Alta CVE-2026-64850 < 2.0.7 2.0.7
  16. Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesystems
    Alta CVE-2026-62230 < 2.0.4 2.0.4
  17. Grav: Unauthenticated denial of service via unbounded image derivative dimensions
    Alta CVE-2026-53653 >= 2.0.0-beta.1, < 2.0.0-rc.8, < 1.7.53 2.0.0-rc.8, 1.7.53
  18. Grav: Twig sandbox allows editor-role users to exfiltrate all plugin secrets via Config::toArray()
    Alta · 7.7 CVE-2026-44738 < 2.0.0-rc.2 2.0.0-rc.2
  19. Low-privileged Grav API users can create super-admin accounts via blueprint-upload
    Alta CVE-2026-42844 < 2.0.0-beta.4 2.0.0-beta.4
  20. Grav is Vulnerable to Stored XSS via Tag Injection
    Alta · 8.9 CVE-2026-42611 < 2.0.0-beta.2 2.0.0-beta.2
  21. Grav has Unauthenticated Path Traversal & Arbitrary File Write in its FormFlash component
    Alta CVE-2026-42608 < 2.0.0-beta.2 2.0.0-beta.2
  22. Grav Vulnerable to Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
    Alta · 8.1 CVE-2026-42609 < 2.0.0-beta.2 2.0.0-beta.2
  23. Grav has multiple RCE vectors: unsafe unserialize (x3), command injection in git clone, SSTI blocklist bypass
    Crítica CVE-2026-56700 < 2.0.0-beta.2 2.0.0-beta.2
  24. Grav Vulnerable to Publisher-Level Stored XSS via Unquoted Event Attributes
    Alta · 8.5 CVE-2026-42612 < 2.0.0-beta.2 2.0.0-beta.2
  25. Grav Vulnerable to Privilege Escalation via Missing Server-Side Validation of groups/access
    Crítica · 9.4 CVE-2026-42613 < 2.0.0-beta.2 2.0.0-beta.2
  26. Grav Vulnerable to Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Feature
    Crítica · 9.1 CVE-2026-42607 < 2.0.0-beta.2 2.0.0-beta.2
  27. Grav may be vulnerable to SSRF attack via Twig Templates
    Crítica · 9.1 CVE-2025-66844 <= 1.7.49.5 sin corrección
  28. Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms
    Alta CVE-2025-66298 < 1.8.0-beta.27 1.8.0-beta.27
  29. Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass
    Alta CVE-2025-66294 < 1.8.0-beta.27 1.8.0-beta.27
  30. Grav vulnerable to Privilege Escalation and Authenticated Remote Code Execution via Twig Injection
    Alta CVE-2025-66297 < 1.8.0-beta.27 1.8.0-beta.27
  31. Grav vulnerable to Path traversal / arbitrary YAML write via user creation leading to Account Takeover / System Corruption
    Alta · 8.8 CVE-2025-66295 < 1.8.0-beta.27 1.8.0-beta.27
  32. Grav vulnerable to Denial of Service via Improper Input Handling in 'Supported' Parameter
    Alta CVE-2025-66305 < 1.8.0-beta.27 1.8.0-beta.27
  33. Grav has Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions
    Alta CVE-2025-66301 < 1.8.0-beta.27 1.8.0-beta.27
  34. Grav is vulnerable to Arbitrary File Read
    Alta · 8.5 CVE-2025-66300 < 1.8.0-beta.27 1.8.0-beta.27
  35. Grav is Vulnerable to Security Sandbox Bypass with SSTI (Server Side Template Injection)
    Alta · 8.8 CVE-2025-66299 < 1.8.0-beta.27 1.8.0-beta.27
  36. Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover esta entrada
    Alta · 8.8 CVE-2025-66296 < 1.8.0-beta.27 1.8.0-beta.27
  37. Grav Vulnerable to Arbitrary File Read to Account Takeover
    Alta · 8.5 CVE-2024-34082 < 1.7.46 1.7.46
  38. Server Side Template Injection (SSTI) via Twig escape handler
    Alta · 8.8 CVE-2024-28119 < 1.7.45 1.7.45
  39. Server Side Template Injection (SSTI)
    Alta · 8.8 CVE-2024-28118 < 1.7.45 1.7.45
  40. Server Side Template Injection (SSTI)
    Alta · 8.8 CVE-2024-28117 < 1.7.45 1.7.45
Mostrar más (14) Mostrando 40 de 54

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