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Microsoft

20 articles

Microsoft Security Blog General Microsoft May 20

Securing the gaming culture of cultures

Read about the unique challenges and rewards of securing gaming platforms and how to better protect gaming communities. The post Securing the gaming culture ...

Microsoft Security Blog →

CSO Online Data Breach Microsoft GitHub May 20

GitHub admits major source code leak after 3,800 internal repositories breached

Microsoft’s GitHub has suffered what appears to be its biggest ever security breach after confirming that attackers exfiltrated code from around 3,800 of the...

T1041

CSO Online →

SecurityWeek General Microsoft May 20

Microsoft Rolls Out Mitigations for ‘YellowKey’ BitLocker Bypass

The exploitation is mitigated by preventing the FsTx Auto Recovery Utility from starting when the WinRE image launches. The post Microsoft Rolls Out Mitigati...

SecurityWeek →

Security Affairs CVE Microsoft May 20

Microsoft issues YellowKey mitigation, no patch yet

Microsoft acknowledged the YellowKey BitLocker bypass flaw and released mitigations, urging admins to disable autofstx.exe and enable TPM+PIN.

1 IOC

Security Affairs →

Microsoft Security Blog General Microsoft May 20

Introducing RAMPART and Clarity: Open source tools to bring safety into Agent development workflow

The AI systems shipping inside enterprises today are fundamentally different from the ones we were building even two years ago, because they have moved well ...

T1598

Microsoft Security Blog →

Cyberscoop General Microsoft GitHub May 20

GitHub says internal repositories were taken in poisoned VS Code extension attack

GitHub said late Tuesday that internal repositories were exfiltrated after an employee device was compromised through a poisoned Visual Studio Code extension...

T1041

Cyberscoop →

The Hacker News Ransomware Microsoft May 20

Microsoft Takes Down Malware-Signing Service Behind Ransomware Attacks

Microsoft on Tuesday said it disrupted a malware-signing-as-a-service (MSaaS) operation that weaponized the company's Artifact Signing system to deliver mali...

The Hacker News →

SC Media TTPs Microsoft May 20

Storm-2949 actor targets Microsoft 365 and Azure environments

Storm-2949 initiates attacks by targeting users with privileged roles, such as IT personnel or senior leadership, using social engineering tactics to obtain ...

T1204

SC Media →

SC Media General Microsoft May 20

Microsoft to phase out SMS authentication for account recovery

Microsoft has announced it will begin phasing out SMS-based authentication and account recovery, citing it as a leading source of fraud.

SC Media →

SC Media Malware Microsoft May 20

Microsoft disrupts Fox Tempest malware-signing service

Fox Tempest operated a platform called signspace[.]cloud, which allowed threat actors to obtain short-lived Microsoft-issued certificates via Artifact Signing.

SC Media →

SC Media General Microsoft May 20

Microsoft addresses Windows Update failures in restricted environments

The failures occur in environments with strict network limitations, including air-gapped systems and heavily firewalled networks.

SC Media →

The Hacker News TTPs Microsoft Broadcom May 20

Webworm Deploys EchoCreep and GraphWorm Backdoors Using Discord and MS Graph API

Cybersecurity researchers have flagged fresh activity from a China-aligned threat actor known as Webworm in 2025, deploying custom backdoors that employ Disc...

The Hacker News →

GBHackers Campaigns Microsoft May 20

Microsoft DurableTask Python Client Targeted in TeamPCP Cyberattack

The ongoing TeamPCP software supply chain campaign has compromised the official Microsoft DurableTask Python client, a widely used package for orchestrating ...

T1195

GBHackers →

CISA Advisories CVE Microsoft Adobe May 20

CISA Adds Seven Known Exploited Vulnerabilities to Catalog

CISA has added seven new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.

6 IOCs

CISA Advisories →

CSO Online Campaigns Microsoft Google Apple SentinelOne May 20

SHub Reaper impersonates Apple, Google, and Microsoft in one MacOS attack chain

A newly disclosed macOS infostealer campaign is exploiting user trust in some of the biggest names in tech to slip past defenses. Researchers at SentinelOne ...

T1204

CSO Online →

GBHackers TTPs Microsoft May 20

GraphWorm Malware Abuses Microsoft OneDrive for Stealthy C2 Operations

A new activity from Webworm, a China-aligned advanced persistent threat (APT) group, revealing a significant evolution in its cyber espionage toolkit during ...

GBHackers →

GBHackers Ransomware Microsoft Intel May 20

Fox Tempest Linked to Malware-Signing Service Abusing Microsoft Artifact Signing

Fox Tempest, a financially motivated threat actor, has been linked to a large-scale malware-signing-as-a-service (MSaaS) operation that abused Microsoft’s Ar...

GBHackers →

GBHackers Campaigns Microsoft May 20

Fake Tax Assessment Pages Spread Windows Malware

Hackers are actively targeting Windows users with fake Indian Income Tax assessment pages in a campaign tracked as TAX#TRIDENT. The campaign begins with frau...

GBHackers →

Help Net Security Data Breach Microsoft GitHub May 20

TeamPCP breached GitHub’s internal codebase via poisoned VS Code extension

Following TeamPCP’s claim that they’ve breached GitHub’s own private code repositories, the Microsoft-owned company launched an investigation and confirmed t...

T1041

Help Net Security →

CSO Online Vulnerability Disclosure Microsoft Google Amazon GitHub May 20

Why some security fixes never reach your vulnerability dashboard

On April 22, for roughly 90 minutes, a malicious version of Bitwarden CLI appeared on npm. Version 2026.

CSO Online →

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