# CVE-2026-89049: Server-side request forgery in the Session Manager port forwarding functionality in AWS Systems Manager Agent

> CVE-2026-89049: Server-side request forgery in the Session Manager port forwarding functionality in AWS Systems Manager Agent. CVSS 9.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-89049
Last updated: 2026-09-10T19:44:21Z

- Published: 2026-09-10 18:34 UTC · Updated: 2026-09-10 19:44 UTC · Assigner: AMZN
- CVSS: 9.9 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS: 0.66%, 51th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1289, CWE-918

## 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.

## Affected vendors and products

- AWS: Amazon SSM Agent

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-89049)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-89049)
- [https://aws.amazon.com/security/security-bulletins/2026-107-aws/](https://aws.amazon.com/security/security-bulletins/2026-107-aws/)
- [https://github.com/aws/amazon-ssm-agent/releases/tag/3.3.4851.0](https://github.com/aws/amazon-ssm-agent/releases/tag/3.3.4851.0)
- [https://github.com/aws/amazon-ssm-agent/security/advisories/GHSA-w9jw-h72g-6hxc](https://github.com/aws/amazon-ssm-agent/security/advisories/GHSA-w9jw-h72g-6hxc)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-89049 · Markdown: https://rewindex.com/cve/CVE-2026-89049.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-89049 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:43.964Z