Windows SmartScreen is a widely deployed Windows security feature; a bypass affecting many endpoints warrants broad IT notification.
CVE-2026-108463
Windows SmartScreen path-equivalence bypass lets attackers bypass warnings over a network.
Is CVE-2026-108463 being exploited?
Not confirmed. CVE-2026-108463 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 0.88% probability of exploitation in the next 30 days.
How severe is CVE-2026-108463?
CVE-2026-108463 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-2026-108463?
Yes. A fix has been recorded for CVE-2026-108463. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-108463 affect?
CVE-2026-108463 affects Microsoft Windows SmartScreen. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-108463?
Install Microsoft update immediately and block/untrusted files or URLs until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can bypass SmartScreen over a network to suppress warnings and enable delivery/execution of malware.
Patch when possible
- affected>= 10.0.26100.0 and < 10.0.26100.9711
- affected>= 10.0.26200.0 and < 10.0.26200.9711
- affected>= 10.0.28000.0 and < 10.0.28000.3231
- affected>= 10.0.26300.0 and < 10.0.26300.9711
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.