CVE-2026-15643Network attack vector

Credential disclosure via unvalidated pagination URL

Published Jul 14, 2026 · Updated Jul 14, 2026

SSRF in AWS HealthLake MCP Server before 0.0.14 allows remote authenticated users to disclose temporary AWS credentials via next_token. The search_fhir_resources and patient_everything tools treat next_token as an outbound URL and attach AWS SigV4 authentication without validating its host. Exploitation requires influence over an LLM-dispatched tool argument; STS tokens are replayable, but signatures and secret access keys are not exposed.

CVSS severity7.3
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in AWS HealthLake MCP Server before 0.0.14 allows remote authenticated users to disclose temporary AWS credentials via next_token. The search_fhir_resources and patient_everything tools treat next_token as an outbound URL and attach AWS SigV4 authentication without validating its host. Exploitation requires influence over an LLM-dispatched tool argument; STS tokens are replayable, but signatures and secret access keys are not exposed.

The record

CVE
CVE-2026-15643
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Amazon Web Services
Product
AWS HealthLake MCP Server
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.0.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Amazon Web Services · AWS HealthLake MCP Serverversion=0 <0.0.14

Published CVSS scores

7.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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