CVE-2026-21510HIGH 8.8CISA KEVEPSS p97.7%

CVE-2026-21510Microsoft Windows Shell Protection Mechanism Failure Vulnerability

Microsoft / Windows

Description

Microsoft Windows Shell contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS25.84% probability of exploitation · percentile 97.7% · 2026-06-18T12:00:27Z
Published2026-02-10
Last modified2026-02-11

CISA KEV entry

Added to KEV: 2026-02-10

Underlying weaknesses· 1

CWE-693

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510
  2. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510

1

TypeTargetConfidenceTier
WeaknessProtection Mechanism Failurecwe-6930%live

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft Windows Shell Protection Mechanism Failure Vulnerabilitykev-cve-2026-215100%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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CVE-2026-32225
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Microsoft Windows Protection Mechanism Failure Vulnerability
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CVE-2026-42829
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CVE-2026-47656
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CVE-2026-42906
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CVE-2026-42907
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.