CVE-2026-55690 EmbedVideo Extension - Stored XSS

EmbedVideo Extension for MediaWiki < 4.1.0 contains a stored XSS caused by unneutralized attacker-controlled service name in exception text returned as HTML, letting users with edit privileges execute code in visitors' browsers, 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 ↗

Details

Type
Stored XSS
Impact
Client Script Exec
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

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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