The Kaltura HTML5 player (mwEmbed / html5lib) contains a local file disclosure vulnerability due to improper validation of the ServiceUrl parameter in mwEmbedLoader.php. This parameter is used as the base URL for a backend request and accepts non‑HTTP schemes such as file://. When an exception or error occurs, the response is subsequently deserialized and its raw contents are reflected to the client in an error message; this enables an unauthenticated, remote attacker to read any arbitrary internal file reachable by the server. Affected versions include html5lib v2.45, v2.103 and earlier, and other v2.x releases exposing the vulnerable endpoint.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://kb.cert.org/vuls/id/308749 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-19913 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-19913 cve-icon
History

Mon, 31 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-918
References
Metrics threat_severity

None

 threat_severity

Important

Wed, 26 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-22

Wed, 26 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-73
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 26 Aug 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-22

Tue, 25 Aug 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-200

Tue, 25 Aug 2026 17:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-200

Tue, 25 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
Description The Kaltura HTML5 player (mwEmbed / html5lib) contains a local file disclosure vulnerability due to improper validation of the ServiceUrl parameter in mwEmbedLoader.php. This parameter is used as the base URL for a backend request and accepts non‑HTTP schemes such as file://. When an exception or error occurs, the response is subsequently deserialized and its raw contents are reflected to the client in an error message; this enables an unauthenticated, remote attacker to read any arbitrary internal file reachable by the server. Affected versions include html5lib v2.45, v2.103 and earlier, and other v2.x releases exposing the vulnerable endpoint.
Title CVE-2026-19913
References
cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published: 2026-08-25T16:21:05.743Z

Updated: 2026-08-26T12:51:16.017Z

Reserved: 2026-08-14T20:08:01.555Z

Link: CVE-2026-19913

cve-icon Vulnrichment

Updated: 2026-08-26T12:50:53.435Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-25T17:17:09.163

Modified: 2026-09-03T17:38:29.613

Link: CVE-2026-19913

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-25T16:21:05Z

Links: CVE-2026-19913 - Bugzilla