Critical Unpatched Kaltura mwEmbed Vulnerabilities Expose Video Platforms to Remote Attacks
Two critical unpatched vulnerabilities in Kaltura's HTML5 video player library (CVE-2026-19913 and CVE-2026-19912) allow remote, unauthenticated attackers to read arbitrary files and execute code on affected servers. The flaws stem from unsafe deserialization in the mwEmbedLoader.php endpoint, affecting both individual customer installations and Kaltura's shared multi-tenant CDN infrastructure. With CVSS scores of 9.1 and 10.0 respectively, these vulnerabilities require only network access to exploit, with no authentication needed. CERT/CC reported being unable to coordinate with Kaltura for patches, leaving administrators to implement workarounds. This incident highlights the growing risk of unpatched vulnerabilities in widely-deployed media platforms and the challenges of coordinating disclosures with unresponsive vendors, particularly as video streaming infrastructure becomes increasingly critical to business operations.
Kill Chain