Vulnerability-Lookup

CVE-2026-55691 (GCVE-0-2026-55691)

Vulnerability from cvelistv5 – Published: 2026-09-15 16:34 – Updated: 2026-09-16 15:44

Title

EmbedVideo Extension : Stored XSS via unsanitized class passed to template

Summary

The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, EmbedHtmlFormatter::toHtml in includes/EmbedService/EmbedHtmlFormatter.php passes the user-supplied class value directly to sprintf while constructing a figure element. A quote in the class value can terminate the class attribute and inject arbitrary HTML attributes or markup into the rendered page. A user able to edit a wiki page can store JavaScript that executes for visitors who render the affected content. This issue is fixed in version 4.1.0.

Severity

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 15:44 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/StarCitizenWiki/mediawiki-exte…	x_refsource_CONFIRM
https://github.com/StarCitizenWiki/mediawiki-exte…	x_refsource_MISC
https://github.com/StarCitizenWiki/mediawiki-exte…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
StarCitizenWiki	mediawiki-extensions-EmbedVideo	Affected: < 4.1.0	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-55691

Vulnerability from fkie_nvd - Published: 2026-09-15 17:17 - Updated: 2026-09-16 16:17

Severity

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84
	security-advisories@github.com	https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/v4.1.0
	security-advisories@github.com	https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-7h5p-637f-jfr7
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-7h5p-637f-jfr7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mediawiki-extensions-EmbedVideo",
          "vendor": "StarCitizenWiki",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.1.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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    {
      "lang": "en",
      "value": "The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, EmbedHtmlFormatter::toHtml in includes/EmbedService/EmbedHtmlFormatter.php passes the user-supplied class value directly to sprintf while constructing a figure element. A quote in the class value can terminate the class attribute and inject arbitrary HTML attributes or markup into the rendered page. A user able to edit a wiki page can store JavaScript that executes for visitors who render the affected content. This issue is fixed in version 4.1.0."
    }
  ],
  "id": "CVE-2026-55691",
  "lastModified": "2026-09-16T16:17:10.127",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 8.6,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
          "version": "3.1"
        },
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      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84"
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}

GHSA-7H5P-637F-JFR7

Vulnerability from github – Published: 2026-06-19 21:15 – Updated: 2026-06-19 21:15

Summary

StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized class passed to template

Details

Summary

The user supplied class value is fed directly into the sprintf call that creates HTML. You can add a quote to escape the class and then inject arbitrary html/javascript to the final output.

Details

The template here adds a figure with a class that is substituted in. This value is provided to sprintf here, an unescaped version of the class supplied by the user.

$template = <<<HTML
    <figure class="%s" data-service="%s" %s %s>
        <div class="embedvideo-wrapper" %s>%s%s%s</div>%s
    </figure>
HTML;

PoC

Note the double quote immediately following the single quote to escape the class attribute in the template:

<youtube class='" onmouseover="alert(document.domain)' id="dQw4w9WgXcQ">dQw4w9WgXcQ</youtube>

Impact

Arbitrary HTML can be inserted into the DOM by any user on any page, 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

JSON

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-2026-55691"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79",
      "CWE-80"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T21:15:03Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nThe user supplied class value is fed directly into the sprintf call that creates HTML. You can add a quote to escape the class and then inject arbitrary html/javascript to the final output.\n\n### Details\nThe template [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedService/EmbedHtmlFormatter.php#L138) adds a figure with a class that is substituted in. This value is provided to sprintf [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedService/EmbedHtmlFormatter.php#L156), an unescaped version of the class supplied by the user.\n\n```\n$template = \u003c\u003c\u003cHTML\n    \u003cfigure class=\"%s\" data-service=\"%s\" %s %s\u003e\n        \u003cdiv class=\"embedvideo-wrapper\" %s\u003e%s%s%s\u003c/div\u003e%s\n    \u003c/figure\u003e\nHTML;\n```\n\n### PoC\nNote the double quote immediately following the single quote to escape the class attribute in the template:\n```\n\u003cyoutube class=\u0027\" onmouseover=\"alert(document.domain)\u0027 id=\"dQw4w9WgXcQ\"\u003edQw4w9WgXcQ\u003c/youtube\u003e\n```\n\n### Impact\nArbitrary HTML can be inserted into the DOM by any user on any page, allowing for JavaScript to be executed.",
  "id": "GHSA-7h5p-637f-jfr7",
  "modified": "2026-06-19T21:15:03Z",
  "published": "2026-06-19T21:15:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-7h5p-637f-jfr7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84"
    },
    {
      "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:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized class passed to template"
}

Sightings

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Nomenclature

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Detection rules are retrieved from Rulezet.

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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.
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Action not permitted

CVE-2026-55691 (GCVE-0-2026-55691)

FKIE_CVE-2026-55691

GHSA-7H5P-637F-JFR7

Summary

Details

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Impact

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