What is the CVSS score of CVE-2026-73901?

CVE-2026-73901 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.2%.

Oracle Helidon CVE-2026-73901

EUVD-2026-62145 MEDIUM

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-258f-pc8p-3mqr

Authentication Bypass Oracle Helidon

4.8

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

4.8 MEDIUM

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

vuln.today AI

4.8 MEDIUM

Network-reachable via HTTP with no auth, but high complexity limits exploitation; no availability impact confirmed and scope remains unchanged.

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

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

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

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 4.5.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

AnalysisAI

Unauthorized data access in Oracle Helidon 4.5.1's Imperative Web Server component allows unauthenticated network-based attackers to read a subset of Helidon-accessible data and perform unauthorized insert, update, or delete operations against the same data store. The 'Authentication Bypass' tag in the intelligence feeds indicates the underlying mechanism circumvents expected access controls on HTTP endpoints. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send crafted HTTP request to Helidon endpoint

Delivery

Satisfy high-complexity bypass condition

Exploit

Circumvent Imperative Web Server authentication check

Execution

Read restricted data subset

Impact

Perform unauthorized insert, update, or delete operations

Access

Send crafted HTTP request to Helidon endpoint

Delivery

Satisfy high-complexity bypass condition

Exploit

Circumvent Imperative Web Server authentication check

Execution

Read restricted data subset

Impact

Perform unauthorized insert, update, or delete operations

Vulnerability AssessmentAI

Exploitation	The vulnerability requires network access to the Helidon Imperative Web Server over HTTP and an unauthenticated interaction satisfying the High Attack Complexity condition - meaning the attacker must engineer specific circumstances beyond a simple unauthenticated request, such as precise request ordering, a particular session or connection state, or a non-default but deployable endpoint configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 base score of 4.8 (Medium) reflects genuine nuance: the attack is network-reachable and requires no authentication (PR:N), but the High Attack Complexity (AC:H) substantially limits exploitability in practice. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated remote attacker targeting a Helidon 4.5.1 microservice identifies HTTP endpoints served by the Imperative Web Server that should require authentication. By crafting specific HTTP requests that satisfy the high-complexity exploitation conditions - such as particular request sequencing, header manipulation, or path traversal - the attacker bypasses the authentication check and gains read access to a data subset and the ability to insert or modify records within Helidon-accessible storage. …
Remediation	Consult the Oracle Critical Patch Update for August 2026 at https://www.oracle.com/security-alerts/cspuaug2026.html for the patched release. … Detailed patch versions, workarounds, and compensating controls in full report.