CVE-2026-15643

AWS HealthLake MCP Server SSRF via Pagination URL

Published Jul 14, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Description

AWS HealthLake MCP Server (awslabs.healthlake-mcp-server) is a Model Context Protocol server that enables AI assistants to interact with AWS HealthLake FHIR datastores. A server-side request forgery in the pagination handling component in AWS awslabs.healthlake-mcp-server before 0.0.14 on all platforms might allow a remote authenticated user to exfiltrate AWS temporary security credentials to an arbitrary endpoint via a crafted next_token parameter. The server does not validate that pagination URLs point back to the expected HealthLake endpoint, allowing an actor to redirect subsequent requests to an actor-controlled server.

Its recommended to upgrade to version 0.0.14 or later.

Analysis

Technical impact

The vulnerability is a server‑side request forgery located in the pagination handling component of the AWS HealthLake MCP Server. A remote authenticated user can insert a crafted next_token value that causes the server to issue HTTP requests to an arbitrary external URL. These requests contain the server’s temporary AWS credentials, enabling an attacker to exfiltrate those credentials.

Affected Systems

The affected product is AWS HealthLake MCP Server (awslabs.healthlake-mcp-server). Versions prior to 0.0.14 on all platforms are vulnerable, regardless of operating system or deployment environment.

Risk and Exploitability

The CVSS score of 9.2 indicates high impact. The EPSS score is reported as less than 1 %, suggesting a low probability of exploitation at a global level, but the flaw remains severe because it requires only an authenticated user. The attack does not require privileged network access; the malicious next_token value can be supplied over the network to the vulnerable server, allowing the attacker to cause the server to contact an arbitrary endpoint. The vulnerability is not listed in the CISA KEV catalog.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

AWS

awslabs.healthlake-mcp-server

unaffected

Version	Status	Constraints
`0`	affected	< 0.0.14

No data.

Vendor Product Versions

Aws

Awslabs.healthlake-mcp-server

Version	Status	Scheme	Platform
`[0,0.0.14)`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the AWS HealthLake MCP Server to version 0.0.14 or later, as recommended by AWS.
If an upgrade is not immediately possible, restrict the MCP Server’s outbound network traffic to only the HealthLake service endpoints, blocking unintended external connections.
Review and tighten IAM policies attached to the MCP Server to limit token scope, ensuring that if credentials are exfiltrated they cannot be used to perform unwanted actions.

Generated by OpenCVE AI on August 1, 2026 at 09:17 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.390% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://aws.amazon.com/security/security-bulletins/2026-054-aws/
https://pypi.org/project/awslabs.healthlake-mcp-server/0.0.14/

History

Nov 10, 2026 9:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jul 14, 2026 8:30 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		AWS HealthLake MCP Server (awslabs.healthlake-mcp-server) is a Model Context Protocol server that enables AI assistants to interact with AWS HealthLake FHIR datastores. A server-side request forgery in the pagination handling component in AWS awslabs.healthlake-mcp-server before 0.0.14 on all platforms might allow a remote authenticated user to exfiltrate AWS temporary security credentials to an arbitrary endpoint via a crafted next_token parameter. The server does not validate that pagination URLs point back to the expected HealthLake endpoint, allowing an actor to redirect subsequent requests to an actor-controlled server. Its recommended to upgrade to version 0.0.14 or later.
Title		AWS HealthLake MCP Server SSRF via Pagination URL
First Time appeared		Aws Aws awslabs.healthlake-mcp-server
Weaknesses		CWE-918
CPEs		cpe:2.3:a:aws:awslabs.healthlake-mcp-server::::::::
Vendors & Products		Aws Aws awslabs.healthlake-mcp-server
References		https://aws.amazon.com/security/security-bulletins/2026-054-aws/ https://pypi.org/project/awslabs.healthlake-mcp-server/0.0.14/
Metrics		cvssV3_1 `{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N'}` cvssV4_0 `{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:H/SI:N/SA:N'}`