Affects Microsoft Windows (widely deployed). Local privilege escalation in core OS component can enable full system compromise when combined with local access or malware; broad IT action warranted.
CVE-2026-85905
Heap overflow in Windows UI Immersive Server allows local privilege escalation.
Is CVE-2026-85905 being exploited?
Not confirmed. CVE-2026-85905 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 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-85905?
CVE-2026-85905 is rated High with a CVSS score of 8.8. 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-2026-85905?
Yes. A fix has been recorded for CVE-2026-85905. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-85905 affect?
CVE-2026-85905 affects Microsoft Windows (UI Immersive Server component). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-85905?
Apply Microsoft's security update immediately and restrict unnecessary local access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Heap-based buffer overflow allows a local authorized attacker to elevate privileges to SYSTEM via the UI Immersive Server component.
Patch when possible