CVE-2026-57440 MediaWiki EmbedVideo Extension - Stored XSS

MediaWiki EmbedVideo Extension < 4.1.0 contains a stored XSS caused by unsanitized video URLs passed into iframe src attribute, letting attackers inject HTML/JavaScript, exploit requires $wgEmbedVideoRequireConsent to be disabled.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.26% chance of exploitation in 30 days
View the NVD record ↗

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
24 September 2026
Updated
15 October 2026
Weakness
CWE-79

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

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