CVE-2026-55691

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Source
https://cve.org/CVERecord?id=CVE-2026-55691
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55691.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55691
Aliases
Published
2026-09-15T16:34:59Z
Modified
2026-09-18T03:30:31Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L CVSS Calculator
Summary
EmbedVideo Extension : Stored XSS via unsanitized class passed to template
Details

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. Prior to 4.1.0, EmbedHtmlFormatter::toHtml in includes/EmbedService/EmbedHtmlFormatter.php passes the user-supplied class value directly to sprintf while constructing a figure element. A quote in the class value can terminate the class attribute and inject arbitrary HTML attributes or markup into the rendered page. A user able to edit a wiki page can store JavaScript that executes for visitors who render the affected content. This issue is fixed in version 4.1.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55691.json"
}
References

Affected packages

Git / github.com/starcitizenwiki/mediawiki-extensions-embedvideo

Affected ranges

Type
GIT
Repo
https://github.com/starcitizenwiki/mediawiki-extensions-embedvideo
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
370156335b325bb81d14d89edf0a1f2643d50a84
Fixed
6982ef6e10a8327a6ecc97eb036f4eb531a6f830
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.1.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

2.*
2.7.2
v1.*
v1.0
v2.*
v2.0
v2.0beta1
v2.0beta2
v2.0beta3
v2.1
v2.1.2
v2.1.3
v2.1.4
v2.1.5
v2.1.6
v2.1.7
v2.1.8
v2.1alpha1
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.2.4
v2.2.5
v2.2.6
v2.2.7
v2.2.8
v2.2.9
v2.3.0
v2.3.1
v2.3.2
v2.3.3
v2.4.0
v2.4.1
v2.5.0
v2.5.2
v2.6.0
v2.6.1
v2.7.0
v2.7.1
v2.7.2
v2.7.3
v2.7.4
v2.8.0
v2.9.0
v3.*
v3.0.0
v3.1.0
v4.*
v4.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55691.json"