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A fresh wave of the Miasma Mini Shai-Hulud supply chain campaign compromised legitimate npm packages under the @immobiliarelabs scope on June 26, 2026. The attack targeted Backstage plugins used for GitLab integration and LDAP authentication, affecting 22 package versions across multiple releases. The malware employs sophisticated techniques including hidden payloads that bypass standard package reviews, steals developer credentials and CI/CD secrets, and exploits GitHub Actions workflows for propagation. The campaign appears linked to a compromised upstream GitHub Action (codfish/semantic-release-action) and leverages deployment-triggered workflows for execution. Stolen credentials include npm tokens, GitHub tokens, cloud credentials, SSH keys, and various authentication secrets, which are exfiltrated to attacker-controlled repositories for further propagation across the ecosystem.
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