CVE-2026-45595: Windows Mark of the Web Security Feature Bypass Vulnerability

mediumCVSS 5.4CVE-2026-45595

Protection mechanism failure in Windows Mark of the Web (MOTW) allows an unauthorized attacker to bypass a security feature over a network.

CSIRTS triage

vendor: Microsoft product: WindowsOther

What: Protection mechanism failure allows an unauthorized attacker to bypass a security feature.
Who is affected: Users of Windows with the Mark of the Web feature.
Urgency: Remediation is important due to a medium severity rating (CVSS 5.4) and potential security bypass.
Action: Apply the latest security patch for Windows.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Windows

Get an email when a new Windows advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.4
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45595

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-455950.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45595	coverage & exploitation status	NVD · CVE.org

Recent advisories for Windows Mark of

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

lowCVE-2026-58052: 7-Zip for Windows through 26.02 fails to preserve the Mark-of-the-Web when extracting a crafte…nvd · 2026-06-28
criticalexploitedCVE-2024-38217: Microsoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerabilitycisa-kev · 2024-09-10
criticalexploitedCVE-2023-36584: Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerabilitycisa-kev · 2023-11-16
criticalexploitedCVE-2022-41049: Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerabilitycisa-kev · 2022-11-14
criticalexploitedCVE-2022-41091: Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerabilitycisa-kev · 2022-11-08