StarCitizenWiki mediawiki-extensions-EmbedVideo up to 4.0.x EmbedHtmlFormatter EmbedHtmlFormatter.php toHtml Class HTML injection

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00-

Summaryinfo

A vulnerability classified as problematic was found in StarCitizenWiki mediawiki-extensions-EmbedVideo up to 4.0.x. This affects the function EmbedHtmlFormatter::toHtml of the file includes/EmbedService/EmbedHtmlFormatter.php of the component EmbedHtmlFormatter. Executing a manipulation of the argument Class can lead to HTML injection. This vulnerability is tracked as CVE-2026-55691. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in StarCitizenWiki mediawiki-extensions-EmbedVideo up to 4.0.x. This vulnerability affects the function EmbedHtmlFormatter::toHtml of the file includes/EmbedService/EmbedHtmlFormatter.php of the component EmbedHtmlFormatter. The manipulation of the argument class with an unknown input leads to a html injection vulnerability. The CWE definition for the vulnerability is CWE-79. 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. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-55691 since 06/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

By approaching the search of inurl:includes/EmbedService/EmbedHtmlFormatter.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.1.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 6.0

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.6
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: HTML injection
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Google Hack: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: mediawiki-extensions-EmbedVideo 4.1.0

Timelineinfo

06/17/2026 CVE reserved
09/15/2026 +90 days Advisory disclosed
09/15/2026 +0 days VulDB entry created
09/15/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-55691 (🔒)
GCVE (CVE): GCVE-0-2026-55691
GCVE (VulDB): GCVE-100-404362

Entryinfo

Created: 09/15/2026 18:50
Changes: 09/15/2026 18:50 (68)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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