Latest cybersecurity reporting from selected sources.

The Cybersecurity and Infrastructure Security Agency (CISA) has issued a postmortem on a data leak in which a contractor published dozens of internal CISA credentials -- including AWS Govcloud keys -- in a public GitHub repository for almost six months before being notified by KrebsOnSecurity. Experts say the gaps identified in the agency's initial response provide important lessons that all security teams should absorb.

CISA reveals how it responded after sensitive AWS GovCloud credentials and internal data were exposed in a public GitHub repository

A public issue can trick GitHub Agentic Workflows into leaking the contents of an organization's private repositories, researchers at Noma Security have shown

GitBait phishing kit abuses GitHub Pages and the SheetBest API to steal Mexican banking credentials

The Miasma credential-stealing attack framework, which has recently targeted open-source ecosystems through supply-chain attacks, was briefly open-sourced on GitHub. [...]

The Miasma worm compromised 73 Microsoft GitHub repos, spreading via AI coding tools and stealing cloud credentials from developers and CI/CD systems. A self-replicating worm called Miasma has compromised 73 Microsoft GitHub repositories and forced GitHub staff to disable them. The affected repos include core Azure infrastructure like azure-functions-host and the entire Durable Task family […]

A large-scale npm supply chain attack compromised over 90 versions of @redhat-cloud-services packages, silently infecting CI/CD environments and developer systems. The malicious code steals credentials from GitHub, cloud platforms, and local machines, then spreads like a worm by republishing trusted packages. Discover how the attack works, what data is at risk, and the steps you can take to protect your organization. The post Preinstall to persistence: Inside the Red Hat npm Miasma credential-stealing campaign appeared first on Microsoft Security Blog.

In just six hours, the campaign quietly pushed thousands of malicious commits to more than 5,500 GitHub repositories, stealing credentials, developer secrets, and more.

Supply-Chain Attack Uses Malicious GitHub Actions Workflow File to Steal SecretsMore than 5,000 GitHub repositories fell victim to an automated campaign, codenamed "Megalodon," in which an attacker injected malicious GitHub Actions that executed a script designed to steal development environment secrets, plus a variety of keys, tokens and other credentials, researchers said.

Security Affairs Malware newsletter includes a collection of the best articles and research on malware in the international landscape Malware Newsletter Popular node-ipc npm Package Infected with Credential Stealer  New Actors Deploy Shai-Hulud Clones: TeamPCP Copycats Are Here Active Supply Chain Attack Compromises @antv Packages on npm actions-cool/issues-helper GitHub Action Compromised: All Tags Point to […]

A supply chain attack targeting the Laravel Lang localization packages has exposed developers to a sophisticated credential-stealing malware campaign after attackers abused GitHub version tags to distribute malicious code through Composer packages. [...]

Lawmakers in both houses of Congress are demanding answers from the U.S. Cybersecurity & Infrastructure Security Agency (CISA) after KrebsOnSecurity reported this week that a CISA contractor intentionally published AWS GovCloud keys and a vast trove of other agency secrets on a public GitHub account. The inquiry comes as CISA is still struggling to contain the breach and invalidate the leaked credentials.

Compromised @antv npm packages deploy the Mini Shai-Hulud payload to steal CI/CD secrets from Linux-based automation environments. The malware executes during npm install and targets credentials across GitHub, AWS, Kubernetes, Vault, npm, and 1Password platforms. The post Mini Shai Hulud: Compromised @antv npm packages enable CI/CD credential theft appeared first on Microsoft Security Blog.

A researcher who found a repository that leaked on GitHub said it was one of the worst he’s witnessed. The post CISA credential leak raises alarms, and Capitol Hill demands answers appeared first on CyberScoop.

The agency's GitHub repository, publicly available since November 2025, was ironically named "Private-CISA."

In yet another software supply chain attack, threat actors have compromised the popular GitHub Actions workflow, actions-cool/issues-helper, to run malicious code that harvests sensitive credentials and exfiltrates them to an attacker-controlled server

Until this past weekend, a contractor for the Cybersecurity & Infrastructure Security Agency (CISA) maintained a public GitHub repository that exposed credentials to several highly privileged AWS GovCloud accounts and a large number of internal CISA systems. Security experts said the public archive included files detailing how CISA builds, tests and deploys software internally, and that it represents one of the most egregious government data leaks in recent history.

Malicious npm Package Lets Attackers Capture Refreshed TokensA researcher has mapped a five-step attack on Claude Code that intercepts the credentials giving AI agents access to Jira, GitHub and Confluence, and demonstrated that the standard incident response move, rotating the stolen token, hands the attacker a fresh one.

A new software supply chain attack campaign has been observed using sleeper packages as a conduit to subsequently push malicious payloads that enabled credential theft, GitHub Actions tampering, and SSH persistence

A large-scale credential harvesting operation has been observed exploiting the React2Shell vulnerability as an initial infection vector to steal database credentials, SSH private keys, Amazon Web Services (AWS) secrets, shell command history, Stripe API keys, and GitHub tokens at scale