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Helidon EUVDEUVD-2026-62150

| CVE-2026-73906 MEDIUM
Improper Access Control (CWE-284)
2026-08-18 secalert_us@oracle.com GHSA-v2xg-859g-3q48
Authentication Bypass Oracle Helidon
5.3
CVSS 3.1 · Vendor: oracle
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Severity by source

Vendor (oracle) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
5.3 MEDIUM

Network-reachable HTTP service with no authentication or user interaction needed; impact confined to partial confidentiality read with no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
Aug 19, 2026 - 02:43 vuln.today

DescriptionCVE.org

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

AnalysisAI

The Imperative Web Server in Oracle Helidon 4.5.0 exposes an authentication bypass that permits remote unauthenticated HTTP attackers to read a subset of application-accessible data. Tagged by Oracle CSIRT as an authentication bypass and disclosed in the August 2026 Critical Patch Update, the flaw carries a CVSS 5.3 Medium score with network-accessible, zero-complexity exploitation conditions - conditions that may understate practical risk given the complete absence of authentication prerequisites. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet- or network-exposed Helidon 4.5.0 HTTP endpoint
Exploit
Send crafted unauthenticated HTTP request
Execution
Bypass Imperative Web Server authentication check
Impact
Receive restricted Helidon-accessible data in response
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Vulnerability AssessmentAI

Exploitation No authentication, user interaction, or special configuration is required - the vulnerability is exploitable by any attacker with HTTP network access to a Helidon 4.5.0 Imperative Web Server instance running in its supported configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N reflects easy remote exploitability with constrained impact - an attacker can passively read a subset of data but cannot modify state or disrupt availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker with HTTP access to a Helidon 4.5.0 Imperative Web Server instance sends a crafted request that bypasses the component's access control check, receiving in response data the server intended to restrict to authenticated callers. Because no public exploit code has been identified at time of analysis, the exact request structure is unknown, but the 'easily exploitable' classification and AC:L rating suggest the bypass requires minimal trial-and-error or tooling.
Remediation Apply the Oracle August 2026 Critical Patch Update per the advisory at https://www.oracle.com/security-alerts/cspuaug2026.html; the exact patched artifact version was not confirmed from available intelligence, so consult the Oracle CPU directly for patch identifiers and download instructions. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-62150 vulnerability details – vuln.today
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