CVE-2026-49819
Unauthenticated initial-superuser flaw enables root RCE in UpSnap web app.
Is CVE-2026-49819 being exploited?
Not confirmed. CVE-2026-49819 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 0.79% probability of exploitation in the next 30 days.
How severe is CVE-2026-49819?
CVE-2026-49819 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-2026-49819?
Yes. A fix has been recorded for CVE-2026-49819. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49819 affect?
CVE-2026-49819 affects UpSnap (web app) versions 4.4.1 through 5.3.5, Endpoint: POST /api/upsnap/init-superuser. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49819?
Upgrade to UpSnap 5.4.0 immediately; block init-superuser endpoint and isolate instances.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can register initial superuser, obtain long-lived JWT, and achieve root remote code execution via shell command.
Immediate action required
- affected>= 4.4.1 and < 5.4.0
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.