How do you patch or mitigate CVE-2023-36025 (Microsoft Windows SmartScreen Security Feature Bypass)?

By NHI Mgmt Group Editorial Team Updated October 19, 2026 Domain: Threats, Abuse & Incident Response

CISA's required action for CVE-2023-36025 is to apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. In practice, find every instance of Microsoft Windows in your estate, apply the vendor security update or documented mitigation, and if no fix can be applied, remove internet exposure or take the product out of service. After patching, review logs for signs of earlier exploitation, because attackers used this flaw in the wild.

What a practical fix for CVE-2023-36025 looks like

The right starting point is inventory and exposure, not just “install a patch.” Because this is a Windows smartscreen security feature bypass, the practical goal is to remove or reduce the chance that users can reach the vulnerable path while you apply the vendor update or documented mitigation. In a Windows estate, that usually means finding every affected host, confirming whether the vulnerable behavior is reachable, and then updating or constraining the system before it can be abused again.

For exploited-in-the-wild issues, the operational question is whether you can verify that the product is both patched and still safely exposed. The strongest triage signal is the CISA KEV listing, which tells you this is not a theoretical bug but one that warrants expedited response and post-fix validation. When the vendor fix is unavailable on a given system, the safer choice is to remove internet exposure or take the product out of service until the risk is contained.

For this page, the most useful companion guidance is the Zero-Day and Exploited Vulnerabilities Guide, because this CVE should be handled like an actively exploited issue with emergency mitigation, not a routine maintenance item. The same response pattern also fits the broader Vulnerability Management Guide: scope, prioritise, remediate, verify, and track exceptions until the exposure is closed.

How to verify you actually removed the exposure

Patching only matters if the vulnerable Windows systems are actually identified and the fix lands everywhere it should. That means checking endpoints, servers, and remote-access hosts that can present a SmartScreen-relevant attack surface, then confirming the update or mitigation is applied consistently rather than assuming the ticket closure means the risk is gone. In practice, you want a host-by-host answer, not a rollout summary.

After mitigation, verify the outcome from the outside as well as the inside. If the affected code path or download flow can still be triggered, treat the system as only partially remediated. This is where the Windows Endpoint Hardening Guide is useful, because SmartScreen should sit inside a broader Windows baseline that also reduces the chance of secondary abuse through weak browser, script, or execution controls.

Where visibility matters most is logging. Keep the Windows event evidence needed to confirm patch deployment, endpoint health, and suspicious user activity around the remediation window. The Windows Event Log Guide is the right companion for confirming whether someone logged in, launched suspicious code, changed settings, or cleared logs around the time the vulnerability may have been used.

What to do if patching must wait

If you cannot patch immediately, the mitigation has to shrink the attack path, not just postpone the decision. Remove unnecessary internet exposure, restrict where the vulnerable host can receive files from, and disable or isolate the affected system if the vendor workaround is not enough. For high-value Windows systems, “temporary risk acceptance” should be rare and time-bounded, because any delay leaves users exposed to the same bypass mechanism.

This is also where endpoint hardening becomes a compensating control rather than a substitute for the fix. The attack surface reduction approach in the Endpoint Hardening Checklist supports the same goal by reducing adjacent execution paths and making it harder for a bypass to become a broader compromise. It does not replace patching, but it can reduce blast radius while you wait.

For this CVE, the mitigation decision should stay tied to the exact host role. A kiosk, jump box, or internet-facing endpoint deserves a lower tolerance for delay than a tightly controlled internal workstation. If the host cannot be patched and cannot be reasonably isolated, it should be retired from service until it can be brought back into a known-safe state.

Risk and Threat Considerations

This kind of bug matters because a security feature bypass often changes the trust boundary rather than crashing the system. If SmartScreen can be bypassed, a file, link, or workflow that would normally trigger protection may be able to reach the user with less friction, which raises the chance of initial execution and follow-on compromise.

Failure mechanism: An attacker delivers content that reaches the vulnerable SmartScreen path before the local protection step can intervene, allowing malicious code or a malicious payload to progress farther than expected.

Impact: The practical impact is easier user deception, more reliable payload delivery, and a better chance of post-exploitation activity on Windows systems that were assumed to be protected.

Standards & Framework Alignment

This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.

NIST SP 800-53 Rev 5, CIS Controls v8, NIST CSF 2.0, OWASP ASVS and NIST SP 800-57 set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
NIST SP 800-53 Rev 5	SI-2 — Flaw Remediation	CVE response requires timely remediation of the identified Windows flaw.
	AU-6 — Audit Record Review, Analysis, and Reporting	Post-patch log review is needed to spot signs of prior exploitation.
	CM-8 — System Component Inventory	Exposure checks depend on knowing where the affected Windows product is deployed.
Recommendation — Prioritise and track remediation of the vulnerable Windows systems until the flaw is fixed or contained. Review audit records for suspicious activity around the exploitation window and remediation event. Maintain an accurate inventory so every vulnerable Windows instance is found and treated.
CIS Controls v8	CIS-7 — Continuous Vulnerability Management	This CVE needs prioritised scanning, remediation, and verification across the estate.
	CIS-8 — Audit Log Management	Logs are needed to investigate earlier exploitation after mitigation.
Recommendation — Continuously identify, remediate, and verify vulnerable Windows assets until exposure is closed. Collect and review Windows logs to confirm exploitation did not occur before the fix.
NIST CSF 2.0	PR.PS-01 — Configuration Management	Applying the vendor update or mitigation is a configuration change to reduce exposure.
	DE.CM-01 — Networks and network services are monitored to find potentially adverse events	Exploitation and exposure checks rely on monitoring affected Windows systems and related traffic.
Recommendation — Apply the approved remediation and validate the new secure configuration on each host. Monitor the affected hosts and related services for signs of suspicious activity after remediation.
OWASP ASVS	V16 — Security Logging and Error Handling	Post-exploitation review depends on usable logs and alerting for suspicious activity.
Recommendation — Retain and review logs so you can reconstruct activity that may have occurred before patching.
NIST SP 800-57	4 — Key Management	If the bypass exposed credentials or tokens, follow-on rotation may be needed to reduce misuse.
Recommendation — Rotate any exposed secrets or credentials after confirming the vulnerability was abused.

Practitioner Guidance

What to prioritise: Start with exposed, user-facing Windows systems and anything that frequently handles downloaded or externally sourced files. Those hosts are the most likely to turn a bypass into real execution opportunity.

What to verify: Confirm three things before closing the issue: the vendor update or mitigation is applied, the vulnerable path is no longer reachable in practice, and the host has not shown signs of suspicious activity during the exposure window.

Practitioner takeaway: For an exploited Windows bypass, the remediation job is not complete until patching, exposure reduction, and post-event hunting all line up on the same host set.

Deepen Your Knowledge

Free weekly newsletter

Subscribe to the NHI & AI Identity Journal

The latest on NHI and Agentic AI security – articles, research, breaches, news and events every week.

Bonus 33% off our NHI Course when you subscribe.

NHIMG Editorial Note
Reviewed and updated by the NHIMG editorial team on October 19, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org