Latest cybersecurity reporting from selected sources.

From late April 2026 to mid-June 2026, Microsoft Defender Experts observed increased ACR Stealer activity across customer environments. These campaigns are successfully using ClickFix lures to steal browser credentials, authentication tokens, and sensitive documents from enterprise environments. The post ACR Stealer: Two observed intrusion chains amid increased threat activity appeared first on Microsoft Security Blog.

At least two distinct threat actors are weaponizing a novel evasion technique called OAuth client ID spoofing in cloud campaigns, while slipping past telemetry

Microsoft has disclosed details of a large-scale credential theft campaign that has leveraged a combination of code of conduct-themed lures and legitimate email services to direct users to attacker-controlled domains and steal authentication tokens

Organizations typically roll out multi-factor authentication (MFA) and assume stolen passwords are no longer enough to access systems. In Windows environments, that assumption is often wrong. Attackers still compromise networks every day using valid credentials. The issue is not MFA itself, but coverage.  Enforced through an identity provider (IdP) such as Microsoft Entra ID, Okta, or

A suspected Russia-aligned group has been attributed to a phishing campaign that employs device code authentication workflows to steal victims' Microsoft 365 credentials and conduct account takeover attacks

Okta uncovers new phishing-as-a-service operation with 'multiple entities' falling victim Multiple attackers using a new phishing service dubbed VoidProxy to target organizations' Microsoft and Google accounts have successfully stolen users' credentials, multi-factor authentication codes, and session tokens in real time, according to security researchers.…

A group linked to Russian intelligence services redirected victims to fake Cloudflare verification pages and exploited Microsoft's device code authentication flow.

The recent mass-theft of authentication tokens from Salesloft, whose AI chatbot is used by a broad swath of corporate America to convert customer interaction into Salesforce leads, has left many companies racing to invalidate the stolen credentials before hackers can exploit them. Now Google warns the breach goes far beyond access to Salesforce data, noting the hackers responsible also stole valid authentication tokens for hundreds of online services that customers can integrate with Salesloft, including Slack, Google Workspace, Amazon S3, Microsoft Azure, and OpenAI.

A large-scale malware campaign specifically targets Minecraft players with malicious mods and cheats that infect Windows devices with infostealers that steal credentials, authentication tokens, and cryptocurrency wallets. [...]

Cybercriminals are promoting malicious Microsoft OAuth apps that masquerade as Adobe and DocuSign apps to deliver malware and steal Microsoft 365 accounts credentials. [...]

A help desk phishing campaign targets an organization's Microsoft Active Directory Federation Services (ADFS) using spoofed login pages to steal credentials and bypass multi-factor authentication (MFA) protections. [...]

Cybersecurity researchers have detailed a new adversary-in-the-middle (AitM) phishing kit that's capable of Microsoft 365 accounts with an aim to steal credentials and two-factor authentication (2FA) codes since at least October 2024

Cybersecurity researchers are warning about malicious email campaigns leveraging a phishing-as-a-service (PhaaS) toolkit called Rockstar 2FA with an aim to steal Microsoft 365 account credentials

Microsoft's Visual Studio Code (VS Code) code editor and development environment contains a flaw that allows malicious extensions to retrieve authentication tokens stored in Windows, Linux, and macOS credential managers. [...]

Microsoft's Visual Studio Code (VS Code) code editor and development environment contains a flaw that allows malicious extensions to retrieve authentication tokens stored in Windows, Linux, and macOS credential managers. [...]

GitHub has put out an advisory detailing what may be an ongoing phishing campaign targeting its users to steal credentials and two-factor authentication (2FA) codes by impersonating the CircleCI DevOps platform

Slippery AiTM attacks targeted more than 10,000 orgs over the past nine months A widespread phishing campaign that has hit more than 10,000 organizations since September 2021 uses adversary-in-the-middle (AiTM) proxy sites to get around multifactor authentication (MFA) features and steal credentials that are then used to compromise business email accounts.…

The massive phishing campaign does not exploit a vulnerability in MFA. Instead, it spoofs an Office 365 authentication page to steal credentials.

Microsoft on Tuesday disclosed that a large-scale phishing campaign targeted over 10,000 organizations since September 2021 by hijacking Office 365's authentication process even on accounts secured with multi-factor authentication (MFA)