What is the CVSS score of EUVD-2026-62133?

EUVD-2026-62133 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-2026-62133

| CVE-2026-73889 MEDIUM

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-g523-9v8v-25c9

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 bypass with partial confidentiality impact only; no integrity or availability consequence confirmed.

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 - 02:47 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

Unauthorized data exposure in Oracle Helidon 4.5.0's Imperative Web Server component allows unauthenticated remote attackers to read a subset of application-accessible data via HTTP. The vulnerability is tagged as an authentication bypass, meaning protections that should gate read access can be circumvented without credentials. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify Helidon 4.5.0 service via HTTP

Exploit

Send unauthenticated crafted HTTP request

Execution

Trigger auth bypass in Imperative Web Server

Impact

Read restricted data subset

Access

Identify Helidon 4.5.0 service via HTTP

Exploit

Send unauthenticated crafted HTTP request

Execution

Trigger auth bypass in Imperative Web Server

Impact

Read restricted data subset

Vulnerability AssessmentAI

Exploitation	The vulnerability requires only network access to a Helidon 4.5.0 instance running the Imperative Web Server component over HTTP - no authentication, no special configuration, and no user interaction are required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 3.1 scores this at 5.3 (Medium), which aligns with the limited scope of impact - partial read access with no integrity or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated attacker with HTTP network access to a Helidon 4.5.0 service sends a crafted request to the Imperative Web Server component, exploiting the authentication bypass to retrieve data that should be restricted to authenticated users. No exploit code is publicly known, but the low attack complexity means exploitation is straightforward once the flaw mechanism is understood. …
Remediation	Oracle addressed this vulnerability as part of the August 2026 Critical Patch Update. … Detailed patch versions, workarounds, and compensating controls in full report.