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Microsoft issues mitigations for YellowKey BitLocker bypass vulnerability (CVE-2026-45585)

Evidence first: scan the strongest sources, then decide whether to go deeper.

Published 2026-05-20 06:21 UTCUpdated 2026-05-21 01:08 UTC
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cveexploitssecurity_toolingincident_response
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Evidence trail (top sources)
top sources (4 domains)domains are deduped. counts indicate coverage, not truth.
4 top sources shown
View all evidence
Overview

Microsoft is addressing a security feature bypass vulnerability in Windows known as YellowKey (CVE-2026-45585) that allows attackers with physical access to bypass BitLocker encryption protections.

Entities
MicrosoftYellowKeyEric GrenierKarl Fosaaen
Score total
1.64
Momentum 24h
5
Posts
5
Origins
5
Source types
1
Duplicate ratio
0%
Why now
  • A public proof of concept exploit for YellowKey is already available.
  • Microsoft has released immediate mitigation guidance amid ongoing patch development.
  • Physical access remains a critical risk factor, emphasizing urgent protective measures.
Why it matters
  • YellowKey allows bypassing BitLocker encryption, risking data exposure on physically accessed devices.
  • Mitigations help protect sensitive data while Microsoft develops a full patch.
  • Organizations must audit and secure devices to prevent exploitation via the recovery environment.
LLM analysis
Topic mix: lowPromo risk: lowSource quality: high
Recurring claims
  • YellowKey (CVE-2026-45585) is a security feature bypass vulnerability that allows attackers with physical access to bypass BitLocker encryption on Windows devices.
  • Microsoft is working on a patch for YellowKey but has provided interim mitigation steps to protect affected systems.
How sources frame it
  • Eric Grenier, Gartner: neutral
  • Karl Fosaaen, NetSPI: neutral
All evidence
All evidence
Microsoft Rolls Out Mitigations for ‘YellowKey’ BitLocker Bypass
SecurityWeek · securityweek.com · 2026-05-20 15:39 UTC
Microsoft provides mitigation for “YellowKey” BitLocker bypass flaw (CVE-2026-45585)
Help Net Security · helpnetsecurity.com · 2026-05-20 08:33 UTC
Microsoft Releases Mitigation for YellowKey BitLocker Bypass CVE-2026-45585 Exploit
thehackernews · thehackernews.com · 2026-05-20 08:28 UTC
NCSC-2026-0165 [1.00] [M/H] Kwetsbaarheid aangetroffen in Microsoft Windows
NCSC NL Security Advisories · advisories.ncsc.nl · 2026-05-20 06:21 UTC
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Top publishers (this list)
  • CSO Online (1)
  • SecurityWeek (1)
  • Help Net Security (1)
  • thehackernews (1)
  • NCSC NL Security Advisories (1)
Top origin domains (this list)
  • csoonline.com (1)
  • securityweek.com (1)
  • helpnetsecurity.com (1)
  • thehackernews.com (1)
  • advisories.ncsc.nl (1)