GHSA-4J5H-MVJ3-M48V

Vulnerability from github – Published: 2025-09-24 20:11 – Updated: 2025-09-26 16:30
VLAI?
Summary
Star Citizen EmbedVideo Extension Stored XSS through wikitext caused by usage of non-reserved data attributes
Details

Summary

The EmbedVideo extension allows adding arbitrary attributes to an HTML element, allowing for stored XSS through wikitext.

Details

The attributes of an iframe are populated with the value of an unreserved data attribute (data-iframeconfig) that can be set via wikitext: https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/ext.embedVideo.videolink.js#L5-L20 Similar code is also present here: https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/modules/iframe.js#L139-L155

It is possible to execute JS through attributes like onload or onmouseenter.

PoC

  1. Create a page with the following contents:
<div class="embedvideo-evl" data-iframeconfig='{"onload": "alert(1)"}'>Click me!</div>
<evlplayer></evlplayer>
  1. Click on the "Click me!" text
  2. Click on the "Load video" button below image

Impact

Arbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.

Severity ?
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "starcitizenwiki/embedvideo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "4.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-59839"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-09-24T20:11:17Z",
    "nvd_published_at": "2025-09-25T14:15:46Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThe EmbedVideo extension allows adding arbitrary attributes to an HTML element, allowing for stored XSS through wikitext.\n\n### Details\n\nThe attributes of an iframe are populated with the value of an unreserved data attribute (`data-iframeconfig`) that can be set via wikitext:\nhttps://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/ext.embedVideo.videolink.js#L5-L20\nSimilar code is also present here:\nhttps://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/modules/iframe.js#L139-L155\n\nIt is possible to execute JS through attributes like `onload` or `onmouseenter`.\n\n### PoC\n\n1. Create a page with the following contents:\n```html\n\u003cdiv class=\"embedvideo-evl\" data-iframeconfig=\u0027{\"onload\": \"alert(1)\"}\u0027\u003eClick me!\u003c/div\u003e\n\u003cevlplayer\u003e\u003c/evlplayer\u003e\n```\n2. Click on the \"Click me!\" text\n3. Click on the \"Load video\" button below\n\u003cimg width=\"855\" height=\"404\" alt=\"image\" src=\"https://github.com/user-attachments/assets/afb3839a-012c-4e90-a208-a6137b704ccd\" /\u003e\n\n\n### Impact\nArbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.",
  "id": "GHSA-4j5h-mvj3-m48v",
  "modified": "2025-09-26T16:30:00Z",
  "published": "2025-09-24T20:11:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-4j5h-mvj3-m48v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59839"
    },
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/4e075d3dc9a15a3ee53f449a684d5ab847e52f01"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo"
    },
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/ext.embedVideo.videolink.js#L5-L20"
    },
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/modules/iframe.js#L139-L155"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Star Citizen  EmbedVideo Extension Stored XSS through wikitext caused by usage of non-reserved data attributes"
}


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