Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-64850: 0.47% estimated exploitation activity in the next 30 days; percentile 40.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
• CVE-2026-65008: 2.49% estimated exploitation activity in the next 30 days; percentile 84.66 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 calluserfuncarray() 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: <BASEURL the site; <SESSIONCOOKIE an admin session cookie for an account with admin.pages; <ADMINNONCE the admin-nonce on any admin page (window.GravAdmin.config.adminnonce). Save a "form" page whose field carries the callable directive: curl…

Published by the source

2 Sep 2026, 14:51 UTC

Last modified by the source

2 Sep 2026, 15:00 UTC

Source last checked

26 Oct 2026, 14:53 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-fj2p-qj2f-74v5

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-fj2p-qj2f-74v5

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# Patch Next advisory brief: CVE-2026-64850

Advisory: Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()
IDs: CVE-2026-64850, GHSA-fj2p-qj2f-74v5
Record: https://patchnext.com/advisories/cve-2026-64850 (revision 3, source checked 26 Oct 2026, 14:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: getgrav/grav 2.0.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist getgrav/grav: affected < 2.0.7; fixed in 2.0.7

## Suggested inspection (read-only)
- Packagist getgrav/grav: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on getgrav/grav.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-fj2p-qj2f-74v5 (OSV record GHSA-fj2p-qj2f-74v5 lists affected ranges: Packagist getgrav/grav >=0 <2.0.7 (fixed))
- Verified: https://github.com/advisories/GHSA-fj2p-qj2f-74v5 (GitHub-reviewed advisory GHSA-fj2p-qj2f-74v5 lists affected ranges: Packagist getgrav/grav >=0 <2.0.7)

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