What is the CVSS score of CVE-2026-71158?

CVE-2026-71158 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.4%.

Which versions of Oracle Helidon are affected by CVE-2026-71158?

Oracle Helidon 3.2.18's Imperative Web Server contains an authentication bypass that allows unauthenticated remote attackers to access all Helidon-managed data from any network-accessible deployment.

How to fix or mitigate CVE-2026-71158?

Within 24 hours, identify all systems running Oracle Helidon 3.2.18 and classify their network exposure (internet-facing vs. internal-only); simultaneously implement emergency network access controls to restrict unauthenticated connectivity to these systems. Within 7 days, deploy compensating controls including a reverse proxy with authentication enforcement, Web Application Firewall rules blocking unauthenticated requests, or complete network segmentation isolating Helidon instances from untrusted networks; document all Helidon 3.2.18 instances and owners. Within 30 days, execute a full remediation: upgrade to unaffected Helidon versions (3.2.19 or later when released, or alternative long-term versions), conduct validation testing, and retire all remaining Helidon 3.2.18 deployments or replace with compensating controls certified for long-term use.

Oracle Helidon CVE-2026-71158

EUVD-2026-62100 HIGH

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-cvq5-9m6g-mg67

Authentication Bypass Oracle Helidon

7.5

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

vuln.today AI

7.5 HIGH

Network-exploitable HTTP authentication bypass with no prerequisites aligns with PR:N/AC:L; confidentiality-only impact with no integrity or availability effect matches the advisory description.

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

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

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Aug 18, 2026 - 22:17 vuln.today

CVE Published

Aug 18, 2026 - 21:18 nvd

HIGH 7.5

DescriptionCVE.org

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

AnalysisAI

Unauthorized data disclosure in Oracle Helidon 3.2.18's Imperative Web Server component exposes all Helidon-accessible data to unauthenticated remote attackers via HTTP. Tagged as an Authentication Bypass, the flaw enables any network-positioned attacker to read critical or complete Helidon-managed data without credentials or user interaction, as confirmed by the AV:N/AC:L/PR:N/UI:N CVSS 3.1 vector. …

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Vulnerability AssessmentAI

Exploitation	The target must be running Oracle Helidon version 3.2.18 with the Imperative Web Server component active and reachable over HTTP from the attacker's network position. … 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:H/I:N/A:N) presents an unambiguous priority signal: network-reachable, zero-prerequisites exploitation with high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	Oracle's August 2026 Critical Patch Update (https://www.oracle.com/security-alerts/cspuaug2026.html) is the primary remediation reference; administrators should consult it directly to obtain the specific patched release and apply the update as soon as operationally feasible. … Detailed patch versions, workarounds, and compensating controls in full report.