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Grav: Stored XSS via page title (data[header][title]) in admin panel

  • Ujawniono: 08.05.2026
  • Aktualizacja: 11.10.2026 10:22

Summary

A Stored Cross-Site Scripting (XSS) vulnerability was identified in the /admin/pages/[page] endpoint of the Grav application. This vulnerability allows attackers to inject malicious scripts into the data[header][title] parameter.

Details

Vulnerable Endpoint: GET /admin/pages/[page] Parameter: data[header][title]

The application fails to properly validate and sanitize user input in the data[header][title] parameter. As a result, attackers can craft a malicious URL with an XSS payload. When this URL is accessed, the injected script is reflected back in the HTTP response and executed within the context of the victim's browser session.

PoC

Payload: <img src=1 onerror=alert(1)>

  1. Log in to the Grav Admin Panel and navigate to Pages.

  2. Create a new page or edit an existing one.

  3. Edit title of the page to <img src=1 onerror=alert(1)>

<img width="1897" height="700" alt="image" src="https://github.com/user-attachments/assets/77a129ca-5c2b-4743-8c56-c17fa456eefa" />

  1. Save page

  2. Open the move function and click on the folder having the payload

<img width="1904" height="984" alt="image" src="https://github.com/user-attachments/assets/44f8f88f-76c4-449f-8c4e-11e8e2c51d8f" /> <img width="1902" height="995" alt="image" src="https://github.com/user-attachments/assets/1dc2ef15-e534-4e87-93ea-92bc573af7f1" />

Impact

Stored cross-site scripting (XSS) attacks can have serious consequences, including:

  • User actions: Attackers can perform actions on behalf of the user

  • Data theft: Sensitive information such as session cookies can be stolen

  • Account compromise: Attackers may impersonate legitimate users

  • Malicious code execution: Arbitrary JavaScript code can run in the user’s browser

  • Website defacement or misinformation: Malicious output may be injected visually

  • User redirection: Victims may be redirected to phishing or malicious websites

By Vu Duc Hieu Contributor Simon Tran

Czego dotyczy

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PlatformaPaczkaPodatne wersjePoprawka w wersji
Paczka Composer getgrav/grav < 1.7.49.5 1.7.49.5

Odnośniki

Ocena CVSS -
Wektor CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H
Słabość (CWE)
CWE-79
Platforma
Composer
Paczka
getgrav/grav
Ujawniono
08.05.2026
Aktualizacja
11.10.2026 10:22

Źródła i licencje

OSV / GitHub Advisory Database - GHSA-fmg2-f5r9-24qc - CC BY 4.0

Historia podatności: getgrav/grav

Wszystkie opisane podatności tej paczki (Paczka Composer), od najnowszej. Widać, czy to jednorazowa wpadka, czy paczka, której trzeba pilnować.

Wszystkie (99) w archiwum
Wszystkich wpisów
99
Pierwsza → ostatnia
11.2019 09.2026
Bez poprawki
6
Wykorzystywana w atakach
0

Rozkład istotności

  • Krytyczna 7
  • Wysoka 47
  • Średnia 41
  • Niska 4

Ujawnienia w latach

Istotność:
  1. Grav CMS vulnerable to remote code execution via .zip file upload
    Wysoka · 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
    Wysoka · 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
    Krytyczna · 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
    Krytyczna · 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`)
    Wysoka · 5.9 CVE-2026-74907 < 2.0.15 2.0.15
  6. Grav: Path Traversal in MediaUploadTrait::deleteFile() Allows Arbitrary File Deletion
    Wysoka · 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
    Wysoka · 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()
    Wysoka · 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
    Wysoka · 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
    Wysoka · 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
    Wysoka 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
    Wysoka · 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
    Wysoka · 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
    Wysoka · 7.4 CVE-2026-62232 < 2.0.4 2.0.4
  15. Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()
    Wysoka CVE-2026-64850 < 2.0.7 2.0.7
  16. Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesystems
    Wysoka CVE-2026-62230 < 2.0.4 2.0.4
  17. Grav: Unauthenticated denial of service via unbounded image derivative dimensions
    Wysoka 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()
    Wysoka · 7.7 CVE-2026-44738 < 2.0.0-rc.2 2.0.0-rc.2
  19. Grav: Stored XSS via page title (data[header][title]) in admin panel ten wpis
    Średnia CVE-2026-44737 < 1.7.49.5 1.7.49.5
  20. Low-privileged Grav API users can create super-admin accounts via blueprint-upload
    Wysoka CVE-2026-42844 < 2.0.0-beta.4 2.0.0-beta.4
  21. Grav is Vulnerable to Stored XSS via Tag Injection
    Wysoka · 8.9 CVE-2026-42611 < 2.0.0-beta.2 2.0.0-beta.2
  22. Grav has Unauthenticated Path Traversal & Arbitrary File Write in its FormFlash component
    Wysoka CVE-2026-42608 < 2.0.0-beta.2 2.0.0-beta.2
  23. Grav Vulnerable to Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
    Wysoka · 8.1 CVE-2026-42609 < 2.0.0-beta.2 2.0.0-beta.2
  24. Grav has multiple RCE vectors: unsafe unserialize (x3), command injection in git clone, SSTI blocklist bypass
    Krytyczna CVE-2026-56700 < 2.0.0-beta.2 2.0.0-beta.2
  25. Grav Vulnerable to Publisher-Level Stored XSS via Unquoted Event Attributes
    Wysoka · 8.5 CVE-2026-42612 < 2.0.0-beta.2 2.0.0-beta.2
  26. Grav Vulnerable to Privilege Escalation via Missing Server-Side Validation of groups/access
    Krytyczna · 9.4 CVE-2026-42613 < 2.0.0-beta.2 2.0.0-beta.2
  27. Grav Vulnerable to Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Feature
    Krytyczna · 9.1 CVE-2026-42607 < 2.0.0-beta.2 2.0.0-beta.2
  28. Grav may be vulnerable to SSRF attack via Twig Templates
    Krytyczna · 9.1 CVE-2025-66844 <= 1.7.49.5 brak poprawki
  29. Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms
    Wysoka CVE-2025-66298 < 1.8.0-beta.27 1.8.0-beta.27
  30. Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass
    Wysoka CVE-2025-66294 < 1.8.0-beta.27 1.8.0-beta.27
  31. Grav vulnerable to Privilege Escalation and Authenticated Remote Code Execution via Twig Injection
    Wysoka CVE-2025-66297 < 1.8.0-beta.27 1.8.0-beta.27
  32. Grav vulnerable to Path traversal / arbitrary YAML write via user creation leading to Account Takeover / System Corruption
    Wysoka · 8.8 CVE-2025-66295 < 1.8.0-beta.27 1.8.0-beta.27
  33. Grav vulnerable to Denial of Service via Improper Input Handling in 'Supported' Parameter
    Wysoka CVE-2025-66305 < 1.8.0-beta.27 1.8.0-beta.27
  34. Grav has Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions
    Wysoka CVE-2025-66301 < 1.8.0-beta.27 1.8.0-beta.27
  35. Grav is vulnerable to Arbitrary File Read
    Wysoka · 8.5 CVE-2025-66300 < 1.8.0-beta.27 1.8.0-beta.27
  36. Grav is Vulnerable to Security Sandbox Bypass with SSTI (Server Side Template Injection)
    Wysoka · 8.8 CVE-2025-66299 < 1.8.0-beta.27 1.8.0-beta.27
  37. Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover
    Wysoka · 8.8 CVE-2025-66296 < 1.8.0-beta.27 1.8.0-beta.27
  38. Grav Vulnerable to Arbitrary File Read to Account Takeover
    Wysoka · 8.5 CVE-2024-34082 < 1.7.46 1.7.46
  39. Server Side Template Injection (SSTI) via Twig escape handler
    Wysoka · 8.8 CVE-2024-28119 < 1.7.45 1.7.45
  40. Server Side Template Injection (SSTI)
    Wysoka · 8.8 CVE-2024-28118 < 1.7.45 1.7.45
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