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This critical SSRF vulnerability in the AWS Systems Manager Agent exposes sensitive link-local services, such as the EC2 Instance Metadata Service, by failing to validate equivalent address representations during port-forwarding sessions. While exploitation requires existing authenticated access, successful compromise allows attackers to retrieve IAM role credentials and pivot to broader AWS API operations if instance permissions are overly permissive. The issue is resolved in agent version 3.3.4851.0, necessitating immediate updates for environments relying on remote management features.
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What this isA model's reading of the article and related coverage, written for aiqbench. Not the publisher's words.

AWS Systems Manager Agent Vulnerability Allows Attackers to Bypass Port-Forwarding Restrictions

Cybersecurity News3 min read

A critical vulnerability in the AWS Systems Manager Agent could let authenticated attackers bypass remote-host port-forwarding restrictions and access sensitive link-local services, including the Amazon EC2 Instance Metadata Service. The flaw, tracked as CVE-2026-89049, affects Amazon SSM Agent versions earlier than 3.3.4851.0 and has been fixed in version 3.3.4851.0. AWS Systems Manager Agent runs on […] The post AWS Systems Manager Agent Vulnerability Allows Attackers to Bypass Port-Forwarding Restrictions appeared first on Cyber Security News.

A critical vulnerability in the AWS Systems Manager Agent could let authenticated attackers bypass remote-host port-forwarding restrictions and access sensitive link-local services, including the Amazon EC2 Instance Metadata Service. The flaw, tracked as CVE-2026-89049, affects Amazon SSM Agent versions earlier than 3.3.4851.0 and has been fixed in version 3.3.4851.0.…

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