CVE-2026-54120
Microsoft Surface input validation flaw allows remote code execution by an authorized attacker.
Is CVE-2026-54120 being exploited?
Not confirmed. CVE-2026-54120 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 0.71% probability of exploitation in the next 30 days.
How severe is CVE-2026-54120?
CVE-2026-54120 is rated Critical with a CVSS score of 9.9. 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-2026-54120?
Yes. A fix has been recorded for CVE-2026-54120. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-54120 affect?
CVE-2026-54120 affects Microsoft Surface devices, Surface Pro, Surface Laptop, Surface Book, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54120?
Apply vendor patch immediately; isolate affected Surface devices until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can trigger remote code execution over a network, enabling full system compromise, persistence, and data exfiltration.
Immediate action required