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GHSA-C29Q-5XM7-5P62

Vulnerability from github – Published: 2026-06-19 21:14 – Updated: 2026-06-19 21:14
VLAI
Summary
StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized service name in exception text
Details

Summary

When passing an unknown service name to embedvideo, an error message is rendered containing the invalid service name. The service name is not sanitized and can contain HTML.

Details

There is a hardcoded list of allowed services in a switch statement inside EmbedServiceFactory#newFromName here. When the service name is not known, an exception is thrown with the service name injected into the message via sprintf here. This message is not sanitized and is marked as isHtml here. Similarly with {{evl: here.

PoC

// Must be on a page, not on ExpandTemplates
{{#ev:<img src=x onerror=alert(document.domain)>|dQw4w9WgXcQ}}
{{#evl:id=dummy|service=<img src=x onerror=alert(document.domain)>}}

Impact

Stored XSS that allows arbitrary Javascript/HTML insertion on any page that a user can edit. It requires no interaction and executes in the wiki origin for every visitor to the page.

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

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.0.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "starcitizenwiki/embedvideo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55690"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79",
      "CWE-80"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T21:14:15Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nWhen passing an unknown service name to embedvideo, an error message is rendered containing the invalid service name. The service name is not sanitized and can contain HTML.\n\n### Details\nThere is a hardcoded list of allowed services in a switch statement inside `EmbedServiceFactory#newFromName` [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedService/EmbedServiceFactory.php#L105). When the service name is not known, an exception is thrown with the service name injected into the message via sprintf [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedService/EmbedServiceFactory.php#L286). This message is not sanitized and is marked as isHtml [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedVideo.php#L303-L311). Similarly with `{{evl:` [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedVideo.php#L177-L183).\n\n### PoC\n```\n// Must be on a page, not on ExpandTemplates\n{{#ev:\u003cimg src=x onerror=alert(document.domain)\u003e|dQw4w9WgXcQ}}\n{{#evl:id=dummy|service=\u003cimg src=x onerror=alert(document.domain)\u003e}}\n```\n\n### Impact\nStored XSS that allows arbitrary Javascript/HTML insertion on any page that a user can edit.  It requires no interaction and executes in the wiki origin for every visitor to the page.",
  "id": "GHSA-c29q-5xm7-5p62",
  "modified": "2026-06-19T21:14:15Z",
  "published": "2026-06-19T21:14:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-c29q-5xm7-5p62"
    },
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/9215564bf28a0ceb40be550a55ab78efc0accc56"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo"
    },
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/v4.1.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized service name in exception text"
}



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