CVE-2026-21947 is a vulnerability in Oracle Java SE, specifically within the JavaFX component. It affects supported versions of Oracle Java SE, particularly version 8u471-b50. This vulnerability is categorized as low severity with a CVSS score of 3.1. The risk to organizations includes unauthorized access to some of Oracle Java SE's accessible data, which can lead to potential data manipulation. Successful exploitation requires human interaction, making it somewhat difficult to exploit.
Organizations utilizing Oracle Java SE should prioritize patching this vulnerability to mitigate risks. The nature of this vulnerability implies that it is primarily a concern for environments where Java is deployed in client-side applications, such as sandboxed Java Web Start applications or applets that run untrusted code. Note that it does not affect server-side Java deployments that only execute trusted code.
As of now, there is no known public exploit for CVE-2026-21947, and it is not included in the known exploitation vulnerability (KEV) catalog. However, organizations are urged to remain vigilant and ensure that they are running the latest versions of affected products.
Organizations should prioritize patching immediately. They can refer to Oracle's advisory for further details on remediation steps.
Vulnerability Details
The official description of this vulnerability states that it allows unauthenticated attackers with network access via multiple protocols to compromise Oracle Java SE. Successful attacks require human interaction from a person other than the attacker, which complicates the exploitation process. However, if successful, attackers can gain unauthorized update, insert, or delete access to Oracle Java SE accessible data.
The CVSS score of 3.1 indicates low severity, with the following parameters: Attack Vector (AV): NETWORK, Attack Complexity (AC): HIGH, Privileges Required (PR): NONE, and User Interaction (UI): REQUIRED. The vulnerability is categorized under CWE-79, which pertains to improper neutralization of input during web page generation ('cross-site scripting').
Technical Analysis
The root cause of this vulnerability lies in how Oracle Java SE processes untrusted code that is loaded into the Java environment. While the Java sandbox is designed to prevent unauthorized access to system resources, vulnerabilities like CVE-2026-21947 illustrate potential weaknesses when untrusted code interacts with the Java platform.
This vulnerability has a network attack vector, which means that an attacker can potentially exploit it remotely. The attack complexity is classified as high, indicating that it may require a sophisticated approach for successful exploitation. Moreover, the lack of required privileges for an attacker means that this vulnerability might be appealing to adversaries looking to compromise systems without prior access.
User interaction is necessary, which can involve tricking a victim into executing malicious code. The impacts on confidentiality and availability are minimal, but there is a low integrity impact, which could affect the data managed by Oracle Java SE.
Risk & Impact Analysis
The risk to organizations includes the potential for unauthorized access to sensitive data and the ability to manipulate that data, which could lead to further exploitation. Since successful exploitation requires human interaction, the likelihood of automated attacks may be lower, but targeted phishing or social engineering attacks could be employed.
Organizations should be aware that while this is a low-severity vulnerability, the potential for data compromise should not be overlooked. The risk is particularly relevant for organizations utilizing Java in client-facing applications. The urgency to address this vulnerability should be assessed within the context of the organization's existing security posture and the criticality of the affected systems.
Based on the CVSS score and the fact that it is not part of the KEV catalog, organizations may consider this vulnerability in their routine maintenance cycles but should prioritize patching as part of their security reviews.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Oracle Java SE include 8u471-b50 for both the JDK and JRE components. Organizations should ensure they are using the latest patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations should implement the latest patches provided by Oracle to remediate this vulnerability. They should also consider conducting a review of their Java deployments to ensure that only trusted code is executed in their environments.
In the absence of an immediate patch, organizations can implement network controls to restrict access to Java applications and employ application whitelisting to ensure only trusted applications are allowed to execute.
Monitoring for unusual behaviors or access patterns related to Java applications can also help identify any potential exploitation attempts.
Detection Guidance
To detect potential exploitation of CVE-2026-21947, organizations should monitor logs for any unauthorized access attempts or abnormal behavior associated with Java applications. Key indicators include unexpected code execution and access to configuration files or sensitive data.
Behavioral anomalies such as unexpected user interactions with Java applications or unusual network activity can also signal potential exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the ongoing challenges organizations face in securing application environments. As Java continues to be a prevalent technology, vulnerabilities like CVE-2026-21947 serve as a reminder of the necessity for vigilance in securing client-side applications.
Security teams should develop a robust vulnerability management program to regularly assess and patch vulnerabilities within their application stacks. This incident underscores the importance of human interaction in exploitation, emphasizing the need for user training and awareness.
For further information on securing Java environments, organizations can refer to our Java security best practices guide.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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