CVE-2026-73866: 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. in Oracle Corporation Helidon
CVE-2026-73866 is a critical vulnerability in Oracle Helidon versions 4.0.0 through 4.4.1 and version 4.5.0. It allows an unauthenticated attacker with network access via HTTP to gain unauthorized creation, deletion, or modification access to critical or all accessible data within Helidon. The vulnerability has a CVSS 3.1 base score of 9.1, indicating high confidentiality and integrity impact without availability impact. Oracle has published a Critical Security Patch Update advisory addressing this and many other vulnerabilities, recommending customers apply patches promptly.
AI Analysis
Technical Summary
This vulnerability affects the Helidon component of Oracle Fusion Middleware's Imperative Web Server. It is exploitable remotely without authentication over HTTP, enabling attackers to compromise the system by unauthorized creation, deletion, or modification of critical data or all data accessible through Helidon. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N) reflects network attack vector, low attack complexity, no privileges or user interaction required, and high confidentiality and integrity impacts. The affected versions explicitly include >=4.0.0 <=4.4.1 and =4.5.0. Oracle's August 2026 Critical Security Patch Update advisory references this vulnerability and strongly urges patching.
Potential Impact
Successful exploitation results in unauthorized access to critical or all Helidon accessible data, including the ability to create, delete, or modify such data. This compromises confidentiality and integrity of the affected system. There is no reported impact on availability. The vulnerability is remotely exploitable without authentication, increasing risk.
Mitigation Recommendations
Oracle has released a Critical Security Patch Update in August 2026 that addresses this vulnerability among others. Customers are strongly advised to apply the official patches promptly. No alternative mitigations or temporary fixes are indicated in the vendor advisory. Maintaining up-to-date patched versions is the recommended remediation.
CVE-2026-73866: 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. in Oracle Corporation Helidon
Description
CVE-2026-73866 is a critical vulnerability in Oracle Helidon versions 4.0.0 through 4.4.1 and version 4.5.0. It allows an unauthenticated attacker with network access via HTTP to gain unauthorized creation, deletion, or modification access to critical or all accessible data within Helidon. The vulnerability has a CVSS 3.1 base score of 9.1, indicating high confidentiality and integrity impact without availability impact. Oracle has published a Critical Security Patch Update advisory addressing this and many other vulnerabilities, recommending customers apply patches promptly.
CVSS v3.1
Score 9.1critical
Affected software
Oracle Corporation
Helidon
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the Helidon component of Oracle Fusion Middleware's Imperative Web Server. It is exploitable remotely without authentication over HTTP, enabling attackers to compromise the system by unauthorized creation, deletion, or modification of critical data or all data accessible through Helidon. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N) reflects network attack vector, low attack complexity, no privileges or user interaction required, and high confidentiality and integrity impacts. The affected versions explicitly include >=4.0.0 <=4.4.1 and =4.5.0. Oracle's August 2026 Critical Security Patch Update advisory references this vulnerability and strongly urges patching.
Potential Impact
Successful exploitation results in unauthorized access to critical or all Helidon accessible data, including the ability to create, delete, or modify such data. This compromises confidentiality and integrity of the affected system. There is no reported impact on availability. The vulnerability is remotely exploitable without authentication, increasing risk.
Mitigation Recommendations
Oracle has released a Critical Security Patch Update in August 2026 that addresses this vulnerability among others. Customers are strongly advised to apply the official patches promptly. No alternative mitigations or temporary fixes are indicated in the vendor advisory. Maintaining up-to-date patched versions is the recommended remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- oracle
- Date Reserved
- 2026-08-13T18:41:45.881Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.oracle.com/security-alerts/cspuaug2026.html","vendor":"Oracle"}]
Threat ID: 6a84ccdcc6e8be0332c393a7
Added to database: 08/18/2026, 21:21:32 UTC
Last enriched: 09/11/2026, 11:17:22 UTC
Last updated: 10/03/2026, 14:46:10 UTC
Views: 25
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