---
title: "CVE-2026-55692: MediaWiki EmbedVideo Extension - Stored XSS"
description: "MediaWiki EmbedVideo Extension < 4.1.0 contains a stored XSS caused by improper escaping of JSON in data-mw-iframeconfig attribute, letting attackers with edit permissions execute JavaScript in wiki origin, exploit requires wiki page edit access."
url: https://panop.io/threat-heartbeat/CVE-2026-55692/
---

# CVE-2026-55692 MediaWiki EmbedVideo Extension - Stored XSS

MediaWiki EmbedVideo Extension < 4.1.0 contains a stored XSS caused by improper escaping of JSON in data-mw-iframeconfig attribute, letting attackers with edit permissions execute JavaScript in wiki origin, exploit requires wiki page edit access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.49% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-55692)

## Details

Type

Stored XSS

Impact

Stored XSS

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to version 4.1.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-55692](https://nvd.nist.gov/vuln/detail/CVE-2026-55692)
- [https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84)
- [https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/v4.1.0](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/v4.1.0)
- [https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-5c7p-g73q-rpg5](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-5c7p-g73q-rpg5)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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