What is CVE-2026-15643?

CVE-2026-15643 is a high-severity vulnerability in AWS Awslabs.healthlake-Mcp-Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.3/10. Published 2026-07-14.

How severe is CVE-2026-15643?

High severity. CVSS v3 base score is 7.3 out of 10.

SSRF in AWS Awslabs.healthlake-Mcp-Server

CVE-2026-15643

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.004 (31.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Aws Awslabs.healthlake-mcp-server — versions 0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)

Frequently asked questions

What is CVE-2026-15643?: CVE-2026-15643 is a high-severity vulnerability in AWS Awslabs.healthlake-Mcp-Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.3/10. Published 2026-07-14.
How severe is CVE-2026-15643?: High severity. CVSS v3 base score is 7.3 out of 10.