Critical SSRF Vulnerability in AWS SSM Agent Allows IAM Credential Theft via Port Forwarding Bypass
Amazon Web Services has disclosed a high-severity server-side request forgery vulnerability in the AWS Systems Manager Agent. The flaw, tracked as CVE-2026-89049, affects the port forwarding feature used by Session Manager and stems from insufficient validation that permits bypass of deny-list restrictions on link-local addresses. Successful exploitation requires port-forwarding permissions but can lead to unauthorized access to instance metadata and temporary IAM role credentials. The company rated the issue as Important with CVSSv4.0 base score 8.5 and CVSSv3.1 score 9.9. The vulnerability was addressed in version 3.3.4851.0 released on 13 July 2026, prior to the public advisory issued on 10 September 2026.
Security NEXTSep 14, 2026Translated from Japanese