The Kaltura HTML5 player (mwEmbed / html5lib) contains an unauthenticated remote code execution vulnerability caused by unsafe data deserialization and unsanitized filesystem path construction. mwEmbedLoader.php accepts a user‑controlled ServiceUrl, whose response is passed to unserialize(), and the resulting object’s fields are written to a cache path derived from attacker‑supplied uiconf_id without proper path validation. An attacker can write arbitrary files into web‑accessible locations and achieve code execution as the webserver user. Affected versions include html5lib v2.45, v2.103 and earlier, and other v2.x releases exposing the vulnerable endpoint.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00594.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Kaltura Kaltura HTML5 Video Player, html5 library affected
Version Status Constraints
0 affected ≤ v2.103
2.45 affected —

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://kb.cert.org/vuls/id/308749 cve-icon cve-icon
History

Wed, 02 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Wed, 02 Sep 2026 00:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-502

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Tue, 25 Aug 2026 22:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-22
CWE-502

Tue, 25 Aug 2026 18:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-502

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

Type Values Removed Values Added
Weaknesses CWE-20
CWE-502

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

Type Values Removed Values Added
Description The Kaltura HTML5 player (mwEmbed / html5lib) contains an unauthenticated remote code execution vulnerability caused by unsafe data deserialization and unsanitized filesystem path construction. mwEmbedLoader.php accepts a user‑controlled ServiceUrl, whose response is passed to unserialize(), and the resulting object’s fields are written to a cache path derived from attacker‑supplied uiconf_id without proper path validation. An attacker can write arbitrary files into web‑accessible locations and achieve code execution as the webserver user. Affected versions include html5lib v2.45, v2.103 and earlier, and other v2.x releases exposing the vulnerable endpoint.
Title CVE-2026-19912
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published:

Updated: 2026-09-01T18:23:56.204Z

Reserved: 2026-08-14T20:07:50.299Z

Link: CVE-2026-19912

cve-icon Vulnrichment

Updated: 2026-09-01T18:23:52.760Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-25T17:17:07.263

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

Link: CVE-2026-19912

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T07:15:04Z

Weaknesses