CVE-2026-19912
Unauthenticated RCE in Kaltura HTML5 player via unsafe deserialization and path write
Is CVE-2026-19912 being exploited?
Not confirmed. CVE-2026-19912 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.59% probability of exploitation in the next 30 days.
How severe is CVE-2026-19912?
CVE-2026-19912 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-19912?
Not known from our data. No patch reference has been recorded for CVE-2026-19912, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-19912 affect?
CVE-2026-19912 affects Kaltura HTML5 player (mwEmbed / html5lib) v2.x (<= v2.103, v2.45 and earlier). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-19912?
Apply vendor patch ASAP; block mwEmbedLoader.php; remove web write perms; scan for web shells
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote code execution: attacker supplies ServiceUrl to trigger unserialize and write arbitrary web files via uiconf_id, executing code as webserver user.
Immediate action required
- affected<= v2.103
- affected2.45
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.