CVE-2026-19912 — CVE-2026-19912

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Kaltura / Kaltura HTML5 Video Player, html5 library	affected 0 through v2.103; affected 2.45

CWE

No CWE identifiers supplied.

References

https://kb.cert.org/vuls/id/308749

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.