What is the CVSS score of CVE-2026-73876?

CVE-2026-73876 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.3%.

Which versions of Helidon are affected by CVE-2026-73876?

Oracle Helidon 4.5.1 contains an authentication bypass vulnerability in its Imperative Web Server that allows attackers to read sensitive data and execute unauthorized modifications without…

How to fix or mitigate CVE-2026-73876?

Within 24 hours: identify all systems running Oracle Helidon 4.5.1, assess their network exposure and protected data sensitivity, and establish an asset register. Within 7 days: implement network isolation restricting Helidon instances to only required internal service-to-service traffic, deploy web application firewall (WAF) rules to block exploit patterns, and enable comprehensive HTTP request logging with alerting. By day 30: conduct forensic audit of data accessed through Helidon since deployment date, establish continuous monitoring for unauthorized access anomalies, and subscribe to Oracle security advisories to apply patches within 24 hours of release.

Helidon CVE-2026-73876

EUVD-2026-62120 HIGH

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-h5cg-wv75-68rm

Authentication Bypass Oracle Helidon

7.2

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

7.2 HIGH

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

vuln.today AI

7.2 HIGH

Network-reachable HTTP endpoint requiring no credentials, scope change to downstream services, with partial confidentiality and integrity impact but no availability impact.

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

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

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Aug 18, 2026 - 22:12 vuln.today

CVE Published

Aug 18, 2026 - 21:18 nvd

HIGH 7.2

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. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. While the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). 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 7.2 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N).

AnalysisAI

Authentication bypass in Oracle Helidon 4.5.1's Imperative Web Server component allows unauthenticated remote attackers to read a subset of accessible data and perform unauthorized insert, update, or delete operations via HTTP. The vulnerability carries a scope-change designation (S:C in CVSS), meaning successful exploitation may cascade beyond Helidon itself to impact additional products or services in the surrounding microservices environment. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify network-reachable Helidon 4.5.1 endpoint

Delivery

Send crafted HTTP request to Imperative Web Server

Exploit

Bypass authentication enforcement layer

Execution

Read subset of unauthorized data

Persist

Perform unauthorized data writes or deletes

Impact

Pivot to downstream services via scope change

Access

Identify network-reachable Helidon 4.5.1 endpoint

Delivery

Send crafted HTTP request to Imperative Web Server

Exploit

Bypass authentication enforcement layer

Execution

Read subset of unauthorized data

Persist

Perform unauthorized data writes or deletes

Impact

Pivot to downstream services via scope change

Vulnerability AssessmentAI

Exploitation	The attacker requires HTTP network access to an Oracle Helidon 4.5.1 instance running the Imperative Web Server component - no authentication is required (PR:N confirmed by CVSS vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 7.2 base score reflects a network-accessible, zero-prerequisite authentication bypass with scope change, placing this firmly in high-severity territory. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated attacker with HTTP network access sends a specially crafted request to Oracle Helidon 4.5.1's Imperative Web Server that circumvents the authentication enforcement layer. Once the bypass succeeds, the attacker reads a subset of data accessible to Helidon and performs unauthorized insert, update, or delete operations on that data. …
Remediation	Apply the patch provided in Oracle's Critical Security Patch Update for August 2026, available at https://www.oracle.com/security-alerts/cspuaug2026.html. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: identify all systems running Oracle Helidon 4.5.1, assess their network exposure and protected data sensitivity, and establish an asset register. …

Threat intelligence, references, and detailed analysis are available after sign-in.