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Oracle Helidon EUVDEUVD-2026-62172

| CVE-2026-73929 HIGH
Improper Access Control (CWE-284)
2026-08-18 secalert_us@oracle.com GHSA-99ph-frr9-hr7w
Denial Of Service Oracle Authentication Bypass Helidon
8.3
CVSS 3.1 · Vendor: oracle
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Severity by source

Vendor (oracle) PRIMARY
8.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
vuln.today AI
8.3 HIGH

Network-accessible HTTP endpoint, no auth or interaction needed, scope change confirmed; individual CIA impacts limited to partial reads/writes per description.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

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:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

2
Analysis Generated
Aug 18, 2026 - 21:56 vuln.today
CVE Published
Aug 18, 2026 - 21:18 nvd
HIGH 8.3

DescriptionCVE.org

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.3. 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 and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 8.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L).

AnalysisAI

Unauthenticated network exploitation of Oracle Helidon 4.5.3's Imperative Web Server component allows remote attackers to partially compromise confidentiality, integrity, and availability of the affected system, with a confirmed scope change meaning attacks can extend impact to additional co-located products or services. The vulnerability is rated 8.3 (High) under CVSS 3.1, elevated by the scope change despite individually low CIA impact ratings. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send crafted HTTP request
Delivery
Target Helidon Imperative Web Server
Exploit
Trigger undisclosed vulnerability
Execution
Read/modify accessible data
Impact
Impact co-located services via scope change
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Vulnerability AssessmentAI

Exploitation No special conditions required for initial access - the CVSS vector AV:N/AC:L/PR:N/UI:N confirms remote unauthenticated exploitation over HTTP against Helidon 4.5.3 in default configurations. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.3 score reflects low-complexity, network-accessible, unauthenticated exploitation with scope change, but each individual impact dimension is rated Low (C:L/I:L/A:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote unauthenticated attacker sends a specially crafted HTTP request to an internet- or network-exposed Helidon 4.5.3 Imperative Web Server instance. Exploitation results in partial unauthorized read and write access to Helidon-accessible data, a partial denial of service, and - due to the scope change - potential impact on adjacent services sharing the same infrastructure. …
Remediation Apply Oracle's Critical Patch Update for August 2026, available via the Oracle advisory at https://www.oracle.com/security-alerts/cspuaug2026.html. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Oracle Helidon 4.5.3 deployments in production and development environments, assess network exposure, and document co-located applications at risk from scope-change impact. …

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EUVD-2026-62172 vulnerability details – vuln.today
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