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Medium

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

  • Disclosed: 08.05.2026
  • Updated: 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

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package getgrav/grav < 1.7.49.5 1.7.49.5

References

CVSS score -
CVSS vector
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
Weakness (CWE)
CWE-79
Platform
Composer
Package
getgrav/grav
Disclosed
08.05.2026
Updated
11.10.2026 10:22

Sources and licenses

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

Vulnerability history: getgrav/grav

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (99) in the archive
Total entries
99
First → latest
11.2019 09.2026
Without a fix
6
Exploited in attacks
0

Severity breakdown

  • Critical 7
  • High 47
  • Medium 41
  • Low 4

Disclosures per year

Severity:
  1. Grav CMS vulnerable to remote code execution via .zip file upload
    High · 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
    High · 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
    Critical · 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
    Critical · 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`)
    High · 5.9 CVE-2026-74907 < 2.0.15 2.0.15
  6. Grav: Path Traversal in MediaUploadTrait::deleteFile() Allows Arbitrary File Deletion
    High · 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
    High · 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()
    High · 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
    High · 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
    High · 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
    High 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
    High · 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
    High · 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
    High · 7.4 CVE-2026-62232 < 2.0.4 2.0.4
  15. Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()
    High CVE-2026-64850 < 2.0.7 2.0.7
  16. Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesystems
    High CVE-2026-62230 < 2.0.4 2.0.4
  17. Grav: Unauthenticated denial of service via unbounded image derivative dimensions
    High 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()
    High · 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 this entry
    Medium 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
    High CVE-2026-42844 < 2.0.0-beta.4 2.0.0-beta.4
  21. Grav is Vulnerable to Stored XSS via Tag Injection
    High · 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
    High 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
    High · 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
    Critical 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
    High · 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
    Critical · 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
    Critical · 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
    Critical · 9.1 CVE-2025-66844 <= 1.7.49.5 no fix
  29. Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms
    High 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
    High 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
    High 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
    High · 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
    High 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
    High CVE-2025-66301 < 1.8.0-beta.27 1.8.0-beta.27
  35. Grav is vulnerable to Arbitrary File Read
    High · 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)
    High · 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
    High · 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
    High · 8.5 CVE-2024-34082 < 1.7.46 1.7.46
  39. Server Side Template Injection (SSTI) via Twig escape handler
    High · 8.8 CVE-2024-28119 < 1.7.45 1.7.45
  40. Server Side Template Injection (SSTI)
    High · 8.8 CVE-2024-28118 < 1.7.45 1.7.45
Show more (15) Showing 40 of 55

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