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EUVD-2026-253447

fkie_cve-2025-59839

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. In versions 4.0.0 and prior, the EmbedVideo extension allows adding arbitrary attributes to an HTML element, allowing for stored XSS through wikitext. This issue has been patched via commit 4e075d3.

GHSA-4j5h-mvj3-m48v — Star Citizen EmbedVideo Extension Stored XSS through wikitext caused by usage of non-reserved data attributes

Affected: Packagist: starcitizenwiki/embedvideo

### 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: ```html <div class="embedvideo-evl" data-iframeconfig='{"onload": "alert(1)"}'>Click me!</div> <evlplayer></evlplayer> ``` 2. Click on the "Click me!" text 3. Click on the "Load video" button below <img width="855" height="404" alt="image" src="https://github.com/user-attachments/assets/afb3839a-012c-4e90-a208-a6137b704ccd" />

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

WID-SEC-W-2025-2341 — MediaWiki Extensions: Mehrere Schwachstellen ermöglichen Codeausführung

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in MediaWiki ausnutzen, um beliebigen Code oder SQL-Befehle auszuführen, Cross-Site-Scripting-Angriffe durchzuführen und vertrauliche Informationen offenzulegen.