by Kastro
Paper/Archive/CVE-2026-19912

CVE-2026-19912

Kaltura Kaltura HTML5 Video Player, html5 library — CVE-2026-19912

EPSS 1%CVSS 9.8
critical.is priorityof 100
42
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 63.2.632 × 2012.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Kaltura HTML5 Video Player, html5 library≤ v2.103–CNA
Kaltura HTML5 Video Player, html5 library2.45–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refkb.cert.org/vuls/id/308749