What is the CVSS score of CVE-2026-73871?

CVE-2026-73871 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: 0.2%.

Oracle Helidon CVE-2026-73871

EUVD-2026-62115 MEDIUM

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-vw4g-q739-7m3m

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 HTTP authentication bypass with read-only partial data exposure; no integrity or availability impact applies, and no privileges or interaction are required.

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 - 02:50 vuln.today

DescriptionCVE.org

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. 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 3.2.18 allows unauthenticated remote attackers to access a subset of data served by the Imperative Web Server component over HTTP, with no credentials or user interaction required. Tagged as an Authentication Bypass by Oracle CERT, the flaw is classified as 'easily exploitable' in Oracle's August 2026 Critical Patch Update advisory. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify Helidon 3.2.18 HTTP endpoint via scanning

Exploit

Send unauthenticated HTTP request to protected resource

Execution

Trigger authentication bypass in Imperative Web Server

Impact

Read accessible Helidon data subset

Access

Identify Helidon 3.2.18 HTTP endpoint via scanning

Exploit

Send unauthenticated HTTP request to protected resource

Execution

Trigger authentication bypass in Imperative Web Server

Impact

Read accessible Helidon data subset

Vulnerability AssessmentAI

Exploitation	No special configuration or authentication is required - exploitation is possible against any Helidon 3.2.18 instance with the Imperative Web Server component reachable over HTTP, consistent with the CVSS vector AV:N/AC:L/PR:N/UI:N. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) places this in the medium band: network-reachable, zero prerequisites, but limited to partial confidentiality loss with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated attacker performing HTTP reconnaissance against an internet-facing Oracle Helidon 3.2.18 service sends crafted requests to endpoints protected by the flawed Imperative Web Server access control layer, bypassing authentication checks without providing any credentials. The attacker retrieves a subset of application data - which may include API responses, internal state, or configuration fragments depending on deployment - purely via standard HTTP interactions. …
Remediation	Apply the fix included in Oracle's August 2026 Critical Patch Update, details available at https://www.oracle.com/security-alerts/cspuaug2026.html. … Detailed patch versions, workarounds, and compensating controls in full report.