Microsoft Warns: Windows Zero-Day ‘YellowKey’ Can Bypass BitLocker

2026-05-23T08:52:03Z7581953306e3c84c88b231a0fdcf803a0ffdb29ca12b326f9f60608ea998369b
ai-enabled-attacksazurebitlockercode-signing-abusecredential-leakgithubinfostealermacosmalware-signingmicrosoftmitigationpatchingprivilege-escalationransomwaresupply-chainwindowsyellowkeyzero-day

What happened

Multiple high-risk incidents and active exploit activity affecting Windows and cloud environments were reported. Microsoft disclosed a zero-day named “YellowKey” that can bypass BitLocker (temporary mitigation available) and related PoCs target BitLocker protections and SYSTEM privilege escalation; Microsoft published workarounds and a Patch Tuesday addressing 120 flaws. Microsoft also disrupted “Fox Tempest,” a malware-signing service abusing Azure certificates to sign malicious payloads. Other notable items: a CISA contractor exposed AWS GovCloud credentials on a public GitHub repo, a macOS

Why it matters

A reviewed impact interpretation has not been published for this record.

Evidence and limitations

Source ID
techrepublic_security
Record identifier
7581953306e3c84c88b231a0fdcf803a0ffdb29ca12b326f9f60608ea998369b
Enrichment time
2026-05-23T08:52:03Z
AI-assisted enrichment
Yes

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