CVE-2026-87913Public exploitNetwork attack vector

Source-code disclosure via predictable S3 bucket reuse

Published Sep 10, 2026 · Updated Sep 10, 2026

Information disclosure in AWS Security Agent MCP Server 0.1.0 through 0.1.5 allows remote attackers to obtain scanned source archives. The bucket setup silently reuses a globally unique, deterministic S3 name after BucketAlreadyExists, and upload_to_s3 omits ExpectedBucketOwner. Exploitation requires pre-registering the victim-derived bucket name; a subsequent scan sends workspace code, credentials, and infrastructure state to that bucket.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in AWS Security Agent MCP Server 0.1.0 through 0.1.5 allows remote attackers to obtain scanned source archives. The bucket setup silently reuses a globally unique, deterministic S3 name after BucketAlreadyExists, and upload_to_s3 omits ExpectedBucketOwner. Exploitation requires pre-registering the victim-derived bucket name; a subsequent scan sends workspace code, credentials, and infrastructure state to that bucket.

The record

CVE
CVE-2026-87913
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Amazon Web Services
Product
AWS Security Agent MCP Server
Classifications
T1567.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=0.1.0 <=0.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Amazon Web Services · AWS Security Agent MCP Serverversion=0.1.0 <=0.1.5

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1567.002Exfiltration to Cloud Storage

Public exploit references

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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