What is the CVSS score of EUVD-2026-62143?

EUVD-2026-62143 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.3%.

Oracle Helidon EUVD-2026-62143

| CVE-2026-73899 MEDIUM

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-gxgw-7w9r-j5m2

Authentication Bypass Oracle Helidon

5.3

CVSS 3.1 · Vendor: oracle

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 unauthenticated HTTP exploitation with partial read-only disclosure confirms AV:N, PR:N, C:L, and I:N/A:N with unchanged scope.

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

Analysis Generated

Aug 19, 2026 - 02:44 vuln.today

DescriptionCVE.org

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.19. 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

Unauthorized data read in Oracle Helidon 3.2.19's Imperative Web Server component allows unauthenticated remote attackers to access a subset of protected application data via HTTP. The CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms trivial network-level exploitation with no credentials or user interaction required, consistent with the intelligence tag of Authentication Bypass. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify Helidon 3.2.19 HTTP listener

Exploit

Send unauthenticated HTTP request to protected endpoint

Execution

Authentication control bypassed by server

Impact

Receive unauthorized data subset in response

Access

Identify Helidon 3.2.19 HTTP listener

Exploit

Send unauthenticated HTTP request to protected endpoint

Execution

Authentication control bypassed by server

Impact

Receive unauthorized data subset in response

Vulnerability AssessmentAI

Exploitation	Exploitation requires network-level HTTP access to a deployment of Oracle Helidon 3.2.19 using the Imperative Web Server (Helidon SE) component - not Helidon MP. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 5.3 Medium score captures a real but bounded risk: network-reachable, zero-prerequisite exploitation lowers the barrier to attempt considerably, but C:L impact limits the damage to a partial data exposure rather than full system compromise or availability loss. … 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 3.2.19 Imperative Web Server sends a crafted or standard HTTP request to an endpoint that should require authorization, exploiting the authentication bypass to receive a response containing protected data. Because the CVSS vector indicates AC:L with no user interaction, the attacker requires no special tooling beyond a basic HTTP client. …
Remediation	Apply Oracle's August 2026 Critical Patch Update as documented at https://www.oracle.com/security-alerts/cspuaug2026.html. … Detailed patch versions, workarounds, and compensating controls in full report.