A server-side request forgery issue due to improper validation of equivalent address representations in the port forwarding to remote hosts functionality in Amazon AWS Systems Manager Agent (SSM Agent) before 3.3.4851.0 on all platforms might allow an authenticated remote user to bypass the remote destination denylist and reach link-local endpoints, potentially obtaining the temporary IAM role credentials of a managed instance and acting with that role's permissions from outside the instance, via a crafted destination host value that uses an alternate representation of a denied link-local address.
To remediate this issue, users should upgrade to version 3.3.4851.0 or later.
Metrics
Affected Vendors & Products
References
History
Thu, 10 Sep 2026 19:30:00 +0000
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| Metrics |
ssvc
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Thu, 10 Sep 2026 18:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | A server-side request forgery issue due to improper validation of equivalent address representations in the port forwarding to remote hosts functionality in Amazon AWS Systems Manager Agent (SSM Agent) before 3.3.4851.0 on all platforms might allow an authenticated remote user to bypass the remote destination denylist and reach link-local endpoints, potentially obtaining the temporary IAM role credentials of a managed instance and acting with that role's permissions from outside the instance, via a crafted destination host value that uses an alternate representation of a denied link-local address. To remediate this issue, users should upgrade to version 3.3.4851.0 or later. | |
| Title | Server-side request forgery in the Session Manager port forwarding functionality in AWS Systems Manager Agent | |
| First Time appeared |
Aws
Aws amazon Ssm Agent |
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| Weaknesses | CWE-1289 CWE-918 |
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| CPEs | cpe:2.3:a:aws:amazon_ssm_agent:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Aws
Aws amazon Ssm Agent |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: AMZN
Published: 2026-09-10T18:34:48.470Z
Updated: 2026-09-10T18:57:53.315Z
Reserved: 2026-09-10T16:58:08.584Z
Link: CVE-2026-89049
Updated: 2026-09-10T18:57:49.503Z
Status : Awaiting Analysis
Published: 2026-09-10T19:17:42.373
Modified: 2026-09-10T19:44:21.980
Link: CVE-2026-89049
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