CVE-2025-66298: Getgrav/grav Grav Is Vulnerable To Server-Side Vulnerability

HIGH
Advisory Identifier: GHSA-8535-hvm8-2hmv
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CWE-1336
Published
Advisory Summary

CVE-2025-66298 is a HIGH grav is vulnerable to server-side vulnerability (CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine) affecting Getgrav/grav libraries in the Packagist ecosystem. The issue involves grav is vulnerable to server-side template injection (ssti) via forms. Remediation is available by upgrading affected packages to version 1.8.0-beta.27.

CVE-2025-66298 at a Glance

CVE Identifier CVE-2025-66298
GHSA Identifier GHSA-8535-hvm8-2hmv
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
Affected Product Getgrav/grav
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2025-66298

To remediate this vulnerability, upgrade all affected Getgrav/grav dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

getgrav/grav fixed: 1.8.0-beta.27 
Upgrade getgrav/grav to 1.8.0-beta.27
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for getgrav/grav

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-66298, inspect your project dependencies for Getgrav/grav:

inspect dependencies for getgrav/grav

Analyze the terminal output to locate any version of Getgrav/grav in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8.0-beta.27), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine, where the product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. In Getgrav/grav, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary Having a simple form on site can reveal the whole Grav configuration details (including plugin configuration details) by using the correct POST payload. Sensitive information may be contained in the configuration details. ### PoC Create a simple form with two fields, 'registration-number' and 'hp'. Add a submit button and set the method to POST(screenshot attached below). Form name set to 'hero-form'. Send a POST request with the following payload and you will notice a response with a php array listing the whole Grav configuration details - including plugins(screenshot attached). registration-number:d643aaaa hp:vJyifp __form-name__:hero-form __unique_form_id__:{{var_dump(_context|slice(0,7))}} ![Screenshot 2025-03-25 at 7 26 02 AM](https://github.com/user-attachments/assets/b92b099b-c07a-4ea2-a3f9-47361ceb9355) ![Screenshot 2025-03-25 at 7 22 58 AM](https://github.com/user-attachments/assets/d9146fd3-5887-4bf8-87d9-78f43ade91c8) ### Impact Server-Side Template (SST) vulnerability. The vulnerability affects the latest Grav version as of 25th of Match 2025 (1.7.48) with all plugins installed (including forms plugin v.7.4.2) to their latest versions as well.

CVE-2025-66298 Affected Getgrav/grav Versions

1 component(s)
Fixed Versions:
1.8.0-beta.27
Product / Package Ecosystem Affected Versions Fixed Version
getgrav/grav
 Packagist
< 1.8.0-beta.27
1.8.0-beta.27

References

GitHub Advisory / Wiki ADVISORY
https://github.com/getgrav/grav/security/advisories/GHSA-8535-hvm8-2hmv
NVD — CVE-2025-66298 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66298
Security Fix Commit FIX COMMIT
https://github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458
Getgrav/grav Source Repository REPOSITORY
https://github.com/getgrav/grav

Frequently Asked Questions

What is CVE-2025-66298?
CVE-2025-66298 is a security vulnerability in Getgrav/grav involving Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine.
Which Getgrav/grav versions are affected?
Affected versions include releases prior to 1.8.0-beta.27 across affected packages: getgrav/grav.
What version fixes CVE-2025-66298?
Upgrading to 1.8.0-beta.27 (or the latest patched release for your respective branch) resolves the vulnerability.
Is getgrav/grav affected?
Yes, getgrav/grav is affected in releases prior to 1.8.0-beta.27. Upgrade your dependency to 1.8.0-beta.27 or later.
What CWE is associated with CVE-2025-66298?
CVE-2025-66298 is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine (The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.).
How can I check Packagist dependencies for CVE-2025-66298?
Run the dependency tree command: 'inspect dependencies for getgrav/grav'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8535-hvm8-2hmv",
  "modified" : "2025-12-02T01:25:33Z",
  "published" : "2025-12-02T01:25:33Z",
  "aliases" : [ "CVE-2025-66298" ],
  "summary" : "Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms",
  "details" : "### Summary\nHaving a simple form on site can reveal the whole Grav configuration details (including plugin configuration details) by using the correct POST payload. Sensitive information may be contained in the configuration details.\n\n### PoC\nCreate a simple form with two fields, 'registration-number' and 'hp'. Add a submit button and set the method to POST(screenshot attached below). Form name set to 'hero-form'. Send a POST request with the following payload and you will notice a response with a php array listing the whole Grav configuration details - including plugins(screenshot attached).\n\nregistration-number:d643aaaa\n\nhp:vJyifp\n\n__form-name__:hero-form\n\n__unique_form_id__:{{var_dump(_context|slice(0,7))}}\n\n\n![Screenshot 2025-03-25 at 7 26 02 AM](https://github.com/user-attachments/assets/b92b099b-c07a-4ea2-a3f9-47361ceb9355)\n\n![Screenshot 2025-03-25 at 7 22 58 AM](https://github.com/user-attachments/assets/d9146fd3-5887-4bf8-87d9-78f43ade91c8)\n\n\n### Impact\nServer-Side Template (SST) vulnerability. The vulnerability affects the latest Grav version as of 25th of Match 2025 (1.7.48) with all plugins installed (including forms plugin v.7.4.2) to their latest versions as well.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getgrav/grav"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.8.0-beta.27"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/getgrav/grav/security/advisories/GHSA-8535-hvm8-2hmv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-66298"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/getgrav/grav"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1336" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-02T01:25:33Z",
    "nvd_published_at" : "2025-12-01T22:15:49Z"
  }
}