CVE-2026-71166Network attack vector

Unauthenticated data compromise via access control flaw

Published Aug 18, 2026 · Updated Aug 20, 2026

Improper access control in Oracle Helidon 3.2.18 allows remote attackers to read and modify data, and interrupt service, via HTTP. Oracle has not published the affected endpoint or handler; public records identify the Imperative Web Server only and map the issue at a high level to improper access control. Exposure requires network reachability to the server with no authentication, and the published impact is bounded to Helidon-accessible data plus partial denial of service rather than full host takeover.

CVSS severity9.4
Critical
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Oracle Helidon 3.2.18 allows remote attackers to read and modify data, and interrupt service, via HTTP. Oracle has not published the affected endpoint or handler; public records identify the Imperative Web Server only and map the issue at a high level to improper access control. Exposure requires network reachability to the server with no authentication, and the published impact is bounded to Helidon-accessible data plus partial denial of service rather than full host takeover.

The record

CVE
CVE-2026-71166
Published
Aug 18, 2026
Updated
Aug 20, 2026
Vendor
Oracle
Product
Helidon
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=3.2.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Helidonversion=3.2.18

Published CVSS scores

9.4OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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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