What is the CVSS score of CVE-2026-73887?

CVE-2026-73887 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.3%.

Which versions of Oracle Helidon are affected by CVE-2026-73887?

Oracle Helidon 4.5.0's Imperative Web Server contains an unauthenticated remote authentication bypass (CVE-2026-73887) allowing attackers to exfiltrate all sensitive data accessible to affected…

How to fix or mitigate CVE-2026-73887?

Within 24 hours, identify and inventory all systems running Oracle Helidon 4.5.0, immediately disable the HTTP/2 protocol on affected instances or disable the Imperative Web Server component if operationally feasible, and assess what sensitive data is currently accessible through these applications. Within 7 days, implement network-level compensating controls such as restricting inbound access to Helidon applications via firewall rules, deploy enhanced logging and alerting to detect exploitation attempts, and begin planning for either an upgrade to a patched version or full replacement. Within 30 days, apply the vendor patch immediately upon release by Oracle, or complete migration to alternative web server components with verified security patches.

Oracle Helidon CVE-2026-73887

EUVD-2026-62131 HIGH

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-gc2j-2hxc-55gx

Authentication Bypass Oracle Helidon

7.5

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

7.5 HIGH

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

vuln.today AI

7.5 HIGH

Network-reachable HTTP/2 service, no credentials required, no user interaction; only confidentiality compromised with no integrity or availability impact.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Aug 18, 2026 - 22:06 vuln.today

CVE Published

Aug 18, 2026 - 21:18 nvd

HIGH 7.5

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/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

AnalysisAI

Unauthenticated remote access to sensitive data affects Oracle Helidon 4.5.0's Imperative Web Server component via HTTP/2, allowing an attacker with network access to read critical or all data accessible to the Helidon application. The vulnerability is tagged as an authentication bypass, consistent with the CVSS vector showing no privileges or user interaction required. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify Helidon 4.5.0 Imperative Web Server endpoint

Exploit

Send crafted HTTP/2 request

Execution

Bypass authentication controls

Impact

Retrieve critical application data

Access

Identify Helidon 4.5.0 Imperative Web Server endpoint

Exploit

Send crafted HTTP/2 request

Execution

Bypass authentication controls

Impact

Retrieve critical application data

Vulnerability AssessmentAI

Exploitation	The target must be running Oracle Helidon version 4.5.0 using the Imperative Web Server component, accessible over HTTP/2. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 score of 7.5 reflects a network-exploitable, low-complexity, no-authentication-required vulnerability with high confidentiality impact - a meaningful threat profile for any internet-facing Helidon service. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated attacker with HTTP/2 network access to a Helidon 4.5.0 Imperative Web Server sends a specially crafted HTTP/2 request that bypasses the application's authentication controls. The attacker then reads sensitive application data - potentially including API responses, configuration data, or business records - without presenting any credentials. …
Remediation	Apply the fixes included in Oracle's Critical 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 and inventory all systems running Oracle Helidon 4.5.0, immediately disable the HTTP/2 protocol on affected instances or disable the Imperative Web Server component if operationally feasible, and assess what sensitive data is currently accessible through these applications. …

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