CVE-2026-73914Network attack vector

Unauthenticated data disclosure and partial DoS

Published Aug 18, 2026 · Updated Aug 19, 2026

Improper access control in Oracle Helidon Imperative Web Server 4.5.0 allows remote attackers to read some data and disrupt service via HTTP. Oracle has not published the implementation-level root cause for this CVE. Helidon 4.5.1 added GraphQL authentication by default plus query-depth and query-complexity limits, which aligns with the disclosed read and partial DoS outcomes but does not prove the exact vulnerable path. Exploitation requires network reachability to the affected HTTP endpoint and no prior authentication; the published impact is limited to reading a subset of application-exposed data and causing partial service interruption, not data modification or full server takeover.

CVSS severity6.5
Medium
EPSS probability0.27%
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 Imperative Web Server 4.5.0 allows remote attackers to read some data and disrupt service via HTTP. Oracle has not published the implementation-level root cause for this CVE. Helidon 4.5.1 added GraphQL authentication by default plus query-depth and query-complexity limits, which aligns with the disclosed read and partial DoS outcomes but does not prove the exact vulnerable path. Exploitation requires network reachability to the affected HTTP endpoint and no prior authentication; the published impact is limited to reading a subset of application-exposed data and causing partial service interruption, not data modification or full server takeover.

The record

CVE
CVE-2026-73914
Published
Aug 18, 2026
Updated
Aug 19, 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 19, 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=4.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Helidonversion=4.5.0

Published CVSS scores

6.5OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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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