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Critical AWS Flaw Lets Attackers Bypass Port Forwarding Restrictions and Steal IAM Credentials

Cyber Press
Cyber Press
Published September 14, 2026Original Report

Excerpt

A critical vulnerability in the AWS Systems Manager (SSM) Agent could allow authorized attackers to bypass Session Manager port-forwarding restrictions, access link-local services, and steal temporary IAM credentials assigned to Amazon EC2 instances . Tracked as CVE-2026-89049, the issue affects AWS Systems Manager Agent versions earlier than 3.3.4851.0. GitHub Security Advisory GHSA-w9jw-h72g-6hxc3 classifies the flaw as critical, with a CVSS v3.1 score reflecting network…

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Indicators of Compromise

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1 indicators

TypeIndicatorConfidenceScoreFirst Seen
CVECVE-2026-89049MediumScore 54/100First seen

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