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9.8

Kaltura HTML5 player lets remote attacker run code

CVE-2026-19912 · published 9 days ago
Summary

The Kaltura HTML5 video player (mwEmbed / html5lib) in versions up to 2.45 and 2.103 can be tricked by anyone on the internet to run code on your server. This lets an attacker place files in web-accessible folders and take control of the website under the same account the site runs on. Update to the newest player version or apply the vendor’s patch and restrict access to the player’s ServiceUrl endpoint.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
kaltura kaltura html5 video player, html5 library <= v2.103
Original advisory text
The Kaltura HTML5 player (mwEmbed / html5lib) contains an unauthenticated remote code execution vulnerability caused by unsafe data deserialization and unsanitized filesystem path construction. mwE...
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.
References
Severity
9.8 Critical
Exploitation
EPSS <1%
Type
CWE-20Improper Input Validation
CWE-22Path Traversal
Timeline
Published25 Aug 2026
Updated2 Sep 2026
First seen25 Aug 2026
Sources
CVE-2026-19912 · NVD
CVE-2026-19912 · MITRE
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