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CVE-2026-45595

Windows Mark of the Web Security Feature Bypass Vulnerability

No known exploitation. EPSS puts it in the 37th percentile. Fixed versions are out.

CVSS 3.15.4MediumEPSS percentile37th0.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products9 fixed builds listed below
Check it yourself

OpenVAS · 16 checks

e.g. OID 1.3.6.1.4.1.25623.1.3.0.10816.0.5094122.494846484649525157514657505152

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Microsoft Windows 10 Version 1607Affected: ≥ 10.0.14393.0, < 10.0.14393.9234Upgrade to: 10.0.14393.9234Affected: ≥ 10.0.17763.0, < 10.0.17763.8880Upgrade to: 10.0.17763.8880Affected: ≥ 10.0.19044.0, < 10.0.19044.7417Upgrade to: 10.0.19044.7417Affected: ≥ 10.0.19045.0, < 10.0.19045.7417Upgrade to: 10.0.19045.7417Stated by: CVE record
  • Microsoft Windows 11 version 23H2Affected: ≥ 10.0.22631.0, < 10.0.22631.7219Upgrade to: 10.0.22631.7219Affected: ≥ 10.0.26100.0, < 10.0.26100.8655Upgrade to: 10.0.26100.8655Affected: ≥ 10.0.26200.0, < 10.0.26200.8655Upgrade to: 10.0.26200.8655Affected: ≥ 10.0.28000.0, < 10.0.28000.2269Upgrade to: 10.0.28000.2269Stated by: CVE record
  • Microsoft Windows Server 2012 R2Affected: ≥ 6.3.9600.0, < 6.3.9600.23228Upgrade to: 6.3.9600.23228Stated by: CVE record
  • Microsoft Windows Server 2016Affected: ≥ 10.0.14393.0, < 10.0.14393.9234Upgrade to: 10.0.14393.9234Stated by: CVE record
  • Microsoft Windows Server 2019Affected: ≥ 10.0.17763.0, < 10.0.17763.8880Upgrade to: 10.0.17763.8880Stated by: CVE record

Versions as the sources state them. 2 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS37th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 37th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

7 events over 44 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. OpenVAS check added
  3. Patch availablerecord updated
  4. Publishedweakness classified

Affected products

And 41 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Scored 5.4 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction RequiredA user must click a link, open a file, or perform some action

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality NoneNo confidentiality impact
  • Integrity LowData modification is possible but limited in scope or consequence
  • Availability LowReduced performance or intermittent disruption of service

Weaknesses

Sources

References in the record

In the news

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We'll flag the next CVE, public exploit or patch for Windows 10 Version 1607, not every advisory.