CVE-2026-48034Public exploitNetwork attack vector

Policy bypass via unbound hardening siblings

Published Jul 24, 2026 · Updated Jul 24, 2026

Access control bypass in Hulumi @hulumi/policies before 1.4.0 allows remote authenticated users to deploy unhardened S3 buckets. The HULUMI-H5 rule checks only for five sibling resource types and fails to bind each sibling's bucket reference or policy ARN to the exempted raw bucket. A consumer or compromised pull request with permission to change Pulumi code can make the hardening pack report compliance while omitting public-access blocking, SSE-KMS, ownership controls, versioning, and a TLS-only policy.

CVSS severity8.5
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control bypass in Hulumi @hulumi/policies before 1.4.0 allows remote authenticated users to deploy unhardened S3 buckets. The HULUMI-H5 rule checks only for five sibling resource types and fails to bind each sibling's bucket reference or policy ARN to the exempted raw bucket. A consumer or compromised pull request with permission to change Pulumi code can make the hardening pack report compliance while omitting public-access blocking, SSE-KMS, ownership controls, versioning, and a TLS-only policy.

The record

CVE
CVE-2026-48034
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
Sherif Mansour
Product
Hulumi
Classifications
CWE-284, T1562.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=< 1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sherif Mansour · Hulumiversion=< 1.4.0

Published CVSS scores

8.5GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1562.001Impair Defenses: Disable or Modify Tools

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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