CVE-2026-73866

CRITICAL 9.1CVE-2026-73866 · Published 18/08/2026 · updated 22/10/2026

In short

CVE-2026-73866 is a CRITICAL (CVSS 9.1) vulnerability affecting helidon (oracle).
Chance of exploitation in the next 30 days (EPSS): 0.43%, higher than 36.8% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
helidon oracle	`= 4.5.0`	No fix yet

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

References

oracle.com/security-alerts/cspuaug2026.html · Vendor Advisory

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Package

Affected versions

Patched versions

helidon

oracle

= 4.5.0

No fix yet

Description

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