Vulnerability-Lookup

GHSA-V8X2-FJV7-8HJH

Vulnerability from github – Published: 2025-12-02 00:36 – Updated: 2025-12-02 00:36

Summary

Grav has Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions

Details

Summary

Due to a broken access control vulnerability in the /admin/pages/{page_name} endpoint, an editor ( user with full permissions to pages ) can change the functionality of a form after submission.

Details

Due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{page_name}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the data[_json][header][form] which is the YAML frontmatter which includes the process section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities.

PoC

Have Admin and Form plugins installed
Connect to panel as admin, create user and give him permission for pages all
Now connect as that user and notice you cant edit any process field in the panel
Change anything in the content of the form and save
Intercept the request:
Now modify the field `data[_json][header][form] with the following payload URL-encoded not like this:

{"name":"ssti-test 2","fields":{"name":{"type":"text","label":"Name","required":true}},"buttons":{"submit":{"type":"submit","value":"Submit"}},"process":[{"message":"{{ evaluate_twig(form.value('name')) }}"}]}

Change the field and forward it:

Request goes through and changes have been made to the form.

Impact

Attacker can modify submission logic of the form which leads to changing redirect value, email sending, changing template, breaking out of the Twig sandbox potentially executing code...

Fix recommendation

Implement proper authorization checks to such requests especially when it contains fields user shouldn't be able to modify based on his role.

Severity

8.6 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.0-beta.27"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66301"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-02T00:36:51Z",
    "nvd_published_at": "2025-12-01T22:15:49Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nDue to a broken access control vulnerability in the `/admin/pages/{page_name}` endpoint, an editor ( user with full permissions to pages ) can change the functionality of a form after submission.\n\n### Details\nDue to improper authorization checks when modifying critical fields on a POST request to `/admin/pages/{page_name}`, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the `data[_json][header][form]` which is the YAML frontmatter which includes the `process` section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities.\n\n### PoC\n\n- Have Admin and Form plugins installed\n- Connect to panel as admin, create user and give him permission for pages all\n- Now connect as that user and notice you cant edit any process field in the panel\n- Change anything in the content of the form and save\n- Intercept the request:\n![image](https://github.com/user-attachments/assets/a66767d9-648e-45b5-9031-4a15bee3072a)\n\n- Now modify the field `data[_json][header][form] with the following payload URL-encoded not like this:\n```\n{\"name\":\"ssti-test 2\",\"fields\":{\"name\":{\"type\":\"text\",\"label\":\"Name\",\"required\":true}},\"buttons\":{\"submit\":{\"type\":\"submit\",\"value\":\"Submit\"}},\"process\":[{\"message\":\"{{ evaluate_twig(form.value(\u0027name\u0027)) }}\"}]}\n```\n\n- Change the field and forward it:\n![image](https://github.com/user-attachments/assets/dd5f95d7-c61f-4fc0-9e9a-e67825f20aea)\n\nRequest goes through and changes have been made to the form.\n![image](https://github.com/user-attachments/assets/42a77e10-571b-43a2-8410-14d82dba28e5)\n\n### Impact\n\n- Attacker can modify submission logic of the form which leads to changing redirect value, email sending, changing template, breaking out of the Twig sandbox potentially executing code...\n\n### Fix recommendation\n\n- Implement proper authorization checks to such requests especially when it contains fields user shouldn\u0027t be able to modify based on his role.",
  "id": "GHSA-v8x2-fjv7-8hjh",
  "modified": "2025-12-02T00:36:51Z",
  "published": "2025-12-02T00:36:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66301"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getgrav/grav"
    }
  ],
  "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:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Grav has Broken Access Control which allows an Editor to modify the page\u0027s YAML Frontmatter to alter form processing actions"
}

CVE-2025-66301 (GCVE-0-2025-66301)

Vulnerability from cvelistv5 – Published: 2025-12-01 21:30 – Updated: 2025-12-02 16:26

Title

Grav ihas Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions

Summary

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{page_name}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the data[_json][header][form] which is the YAML frontmatter which includes the process section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities. This vulnerability is fixed in 1.8.0-beta.27.

Severity

8.6 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-02 16:26 UTC

CWE

CWE-285 - Improper Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7600 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/getgrav/grav/security/advisori…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
getgrav	grav	Affected: < 1.8.0-beta.27

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-66301",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-02T16:26:05.124712Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-02T16:26:11.043Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "grav",
          "vendor": "getgrav",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.0-beta.27"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{page_name}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the data[_json][header][form] which is the YAML frontmatter which includes the process section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities. This vulnerability is fixed in 1.8.0-beta.27."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.6,
            "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:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-285",
              "description": "CWE-285: Improper Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T21:30:43.359Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh"
        }
      ],
      "source": {
        "advisory": "GHSA-v8x2-fjv7-8hjh",
        "discovery": "UNKNOWN"
      },
      "title": "Grav ihas Broken Access Control which allows an Editor to modify the page\u0027s YAML Frontmatter to alter form processing actions"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-66301",
    "datePublished": "2025-12-01T21:30:43.359Z",
    "dateReserved": "2025-11-26T23:11:46.394Z",
    "dateUpdated": "2025-12-02T16:26:11.043Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

GHSA-V8X2-FJV7-8HJH

Summary

Details

PoC

Impact

Fix recommendation

CVE-2025-66301 (GCVE-0-2025-66301)

Tags

Sightings

Nomenclature

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