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CVE-2026-73892 is a vulnerability identified in the Helidon product of Oracle Fusion Middleware, specifically within its Imperative Web Server component. The affected version is Helidon 4.5.0. This flaw is rooted in an Improper Access Control weakness, categorized under CWE-284, which allows an attacker to bypass intended access restrictions.
The vulnerability is easily exploitable and requires no authentication. An attacker with network access can exploit it over the HTTP protocol. The core of the issue lies in how the Imperative Web Server handles authorization for specific requests. Due to improper validation, an unauthenticated attacker can send crafted HTTP requests that the server processes without sufficient permission checks.
Successful exploitation allows an attacker to perform unauthorized actions on the data accessible to the Helidon application. This includes the ability to read a subset of data and to update, insert, or delete some of the accessible data. While the vulnerability does not allow for full system takeover, it poses a significant risk to data confidentiality and integrity. The attack complexity is low, and the attacker does not require any privileges or user interaction, making it a prime target for automated scanning and exploitation. Given that Helidon is a framework for building microservices, a successful attack could lead to data breaches, data corruption, or the disruption of dependent services.
DailyCVE Form:
Platform: Oracle Fusion Middleware
Version: 4.5.0
Vulnerability : Improper Access Control
Severity: Medium (6.5)
date: 2026-08-18
Prediction: 2026-09-15
What Undercode Say:
Analytics show this CVE is highly likely to be exploited due to its low complexity and network attack vector. The public-facing nature of many Helidon applications increases the risk.
– Check version: `java -jar helidon-app.jar –version`
– Search logs: `grep “Unauthorized” /path/to/helidon/logs`
Exploit: (Educational Purposes!)
A proof-of-concept would involve sending a GET or POST request to a vulnerable endpoint without proper authorization headers. The specific endpoint depends on the application’s routing configuration. An attacker could use curl:
curl -X GET http://target-helidon-app:8080/sensitive-data
If the server improperly handles this request, it might return data that should be protected.
Protection:
- Patch: Upgrade to Helidon version 4.5.1 or later.
- Network Restriction: Limit access to the Helidon server using firewall rules:
iptables -A INPUT -p tcp --dport 8080 -s 192.168.1.0/24 -j ACCEPT iptables -A INPUT -p tcp --dport 8080 -j DROP
- Reverse Proxy: Place an authentication-required reverse proxy in front of Helidon.
Impact:
- Confidentiality: Unauthorized read access to a subset of Helidon-accessible data.
- Integrity: Unauthorized update, insert, or delete access to some Helidon-accessible data.
- Availability: Potential for partial denial of service.
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Sources:
Reported By: nvd.nist.gov
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