AmazonAnalysisAmazon Web Services patches CI/CD serverless toolchain privilege escalation flaw
What happened.Amazon Web Services issued security bulletin 2026-141-AWS detailing a resolved privilege escalation vulnerability in the AWS CI/CD toolchain for serverless applications.
Why it matters.Serverless continuous delivery pipelines frequently retain elevated deployment privileges to provision shared cloud infrastructure. Weak privilege boundaries inside build toolchains expose entire AWS accounts to internal lateral compromise. Cloud platform teams must upgrade active toolchain stacks to version 1.0.11 and verify repository branch protections.
The technical specifications:
- Access flaw: Tracked as CVE-2026-112407 with an 8.8 CVSS score, improper IAM privilege assignments in pipeline stacks allowed users with repository write access to escalate credentials.
- Scope of compromise: Attackers could alter serverless deployment templates to gain unauthorized read and write access to cloud resources located outside the intended application boundary within the same account.
- Remediation release: AWS resolved the misconfiguration in serverless toolchain version 1.0.11, instructing engineering teams to update existing pipeline deployments and audit IAM roles.