Is CVE-2026-57440 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-57440 being exploited in the wild.

How severe is CVE-2026-57440?

High severity, with a CVSS score of 7.5, published 24 September 2026.

Which products and versions are affected?

starcitizenwiki/embedvideo (Packagist) <= 4.0.0, ECOSYSTEM:introduced=0,fixed=4.1.0; StarCitizenWiki EmbedVideo <= 4.0.0.

Is there a fix for CVE-2026-57440?

Yes. starcitizenwiki/embedvideo (Packagist): upgrade to 4.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-57440 attacked?

It is attacked over the network.

Am I affected by CVE-2026-57440?

Check whether you run starcitizenwiki/embedvideo (Packagist) or StarCitizenWiki EmbedVideo at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-57440: MediaWiki EmbedVideo Extension stored XSS via unescaped iframe src

Q: Is there a fix for CVE-2026-57440?

Yes. starcitizenwiki/embedvideo (Packagist): upgrade to 4.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-57440 attacked?

It is attacked over the network.

Q: Am I affected by CVE-2026-57440?

Check whether you run starcitizenwiki/embedvideo (Packagist) or StarCitizenWiki EmbedVideo at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-57440 · Severity: high · CVSS 7.5 · Published 2026-09-24

The EmbedVideo extension for MediaWiki allows wiki editors to embed videos on pages. When a specific configuration option is disabled, the extension fails to sanitize user-supplied video identifiers before inserting them into HTML iframe elements, allowing attackers to inject arbitrary JavaScript code that executes for all page visitors without requiring any user interaction.

Technologies: starcitizenwiki/embedvideo (Packagist), StarCitizenWiki EmbedVideo. Vendors: Packagist, StarCitizenWiki.

Quick answers

Is CVE-2026-57440 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-57440 being exploited in the wild.
How severe is CVE-2026-57440?: High severity, with a CVSS score of 7.5, published 24 September 2026.
Which products and versions are affected?: starcitizenwiki/embedvideo (Packagist) <= 4.0.0, ECOSYSTEM:introduced=0,fixed=4.1.0; StarCitizenWiki EmbedVideo <= 4.0.0.
Is there a fix for CVE-2026-57440?: Yes. starcitizenwiki/embedvideo (Packagist): upgrade to 4.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57440 attacked?: It is attacked over the network.
Am I affected by CVE-2026-57440?: Check whether you run starcitizenwiki/embedvideo (Packagist) or StarCitizenWiki EmbedVideo at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

starcitizenwiki/embedvideo (Packagist): upgrade to 4.1.0 or later
```
composer require starcitizenwiki/embedvideo:^4.1.0
```

Technical details

The vulnerability is a stored cross-site scripting (XSS) flaw in the EmbedHtmlFormatter component. The vulnerable code directly incorporates URLs returned by getUrl() into iframe src attributes without sanitization. Multiple service-specific regex patterns (archiveorg, wistia, sharepoint) allow double-quote characters to be passed through, enabling escape of the src attribute and injection of HTML event handlers. The flaw requires $wgEmbedVideoRequireConsent to be set to false (non-default configuration). Any user with page-editing privileges can inject malicious parameters via embedvideo tags; the injected JavaScript executes automatically with autofocus attributes and affects all visitors viewing the compromised wiki page. The vulnerability is patched in version 4.1.0.

Affected products

StarCitizenWiki EmbedVideo <= 4.0.0

Identifiers

CVE-2026-57440
GHSA-v65j-hff3-753c

Timeline

2026-06-24: disclosed
2026-06-24: patched: Version 4.1.0 released
2026-09-25: advisory

References

https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-v65j-hff3-753c

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