CVE-2025-66843: Getgrav/grav Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-mh85-44c2-3m97
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2025-66843 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Getgrav/grav libraries in the Packagist ecosystem. The issue involves grav is vulnerable to stored xss through authenticated user-edited content. Remediation is available in the latest vendor maintenance releases.

CVE-2025-66843 at a Glance

CVE Identifier CVE-2025-66843
GHSA Identifier GHSA-mh85-44c2-3m97
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Getgrav/grav
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2025-66843

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: Latest secure release 
Upgrade getgrav/grav to Latest secure release
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-2025-66843, 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 the patched release), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. 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

grav before v1.7.49.5 has a Stored Cross-Site Scripting (Stored XSS) vulnerability in the page editing functionality. An authenticated low-privileged user with permission to edit content can inject malicious JavaScript payloads into editable fields. The payload is stored on the server and later executed when any other user views or edits the affected page.

CVE-2025-66843 Affected Getgrav/grav Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
getgrav/grav
 Packagist
≤ 1.7.49.5

References

NVD — CVE-2025-66843 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66843
Getgrav/grav Source Repository REPOSITORY
https://github.com/Yohane-Mashiro/grav_cve/issues/1
Getgrav/grav Source Repository REPOSITORY
https://github.com/getgrav/grav

Frequently Asked Questions

What is CVE-2025-66843?
CVE-2025-66843 is a security vulnerability in Getgrav/grav involving Grav is vulnerable to Stored XSS through authenticated user-edited content under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Getgrav/grav versions are affected?
Affected versions include releases prior to current release patches across affected packages: getgrav/grav.
What version fixes CVE-2025-66843?
Upgrading to current release patches (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 Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2025-66843?
CVE-2025-66843 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2025-66843?
CVE-2025-66843 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2025-66843?
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-mh85-44c2-3m97",
  "modified" : "2025-12-17T19:47:29Z",
  "published" : "2025-12-15T18:30:39Z",
  "aliases" : [ "CVE-2025-66843" ],
  "summary" : "Grav is vulnerable to Stored XSS through authenticated user-edited content",
  "details" : "grav before v1.7.49.5 has a Stored Cross-Site Scripting (Stored XSS) vulnerability in the page editing functionality. An authenticated low-privileged user with permission to edit content can inject malicious JavaScript payloads into editable fields. The payload is stored on the server and later executed when any other user views or edits the affected page.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getgrav/grav"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.7.49.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-66843"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Yohane-Mashiro/grav_cve/issues/1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/getgrav/grav"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-17T19:47:29Z",
    "nvd_published_at" : "2025-12-15T16:15:53Z"
  }
}