Targets Microsoft Windows Runtime (widely deployed); allows remote privilege escalation to SYSTEM, potentially disrupting enterprise operations.
CVE-2026-50340
Use-after-free in Windows Runtime allows remote privilege escalation to SYSTEM.
Is CVE-2026-50340 being exploited?
Not confirmed. CVE-2026-50340 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 0.74% probability of exploitation in the next 30 days.
How severe is CVE-2026-50340?
CVE-2026-50340 is rated High with a CVSS score of 8.5. 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-2026-50340?
Yes. A fix has been recorded for CVE-2026-50340. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-50340 affect?
CVE-2026-50340 affects Microsoft Windows Runtime, Microsoft Windows (client/server). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-50340?
Apply vendor patch when available; restrict network access and monitor endpoints.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated remote attacker can exploit a use-after-free in Windows Runtime to gain SYSTEM privileges, enabling remote code execution and persistence.
Immediate action required
- affected>= 10.0.26100.0 and < 10.0.26100.8875
- affected>= 10.0.26200.0 and < 10.0.26200.8875
- affected>= 10.0.28000.0 and < 10.0.28000.2525
- affected>= 10.0.26100.0 and < 10.0.26100.33158
- affected>= 10.0.26100.0 and < 10.0.26100.33158
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.