Threats / Microsoft / CVE-2023-36884
CVE-2023-36884
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows Search vulnerability allows attackers to bypass Mark of the Web defenses via specially crafted files, enabling remote code execution.
Verdict
Today item, not a backlog item.
A race condition in Windows Search permits MOTW bypass on malicious files, facilitating code execution. Active exploitation and ransomware deployment confirm critical severity despite missing CVSS score.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
39 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-07-17), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.99083 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-362 Race Condition.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
WeaknessCWE-362 · Race Condition
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious file designed to exploit the race condition in Windows Search's MOTW handling.
Business
Attackers gain ability to deliver executable payloads that bypass security zone restrictions.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I deliver the file to a target via email, web download, or file sharing, relying on the MOTW bypass.
Business
Initial access vectors become more effective as traditional file-based defenses fail to trigger warnings.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute code with user privileges when the file is opened, bypassing security prompts.
Business
Remote code execution occurs on victim systems without user awareness or intervention.
4
Data at risk — exfiltration narrative 4
Attacker
I deploy ransomware or establish persistence for further compromise.
Business
Organizations face data encryption, operational disruption, and extortion demands from ransomware campaigns.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05