CVE-2026-21939 is a high-severity vulnerability affecting the SQLcl component of Oracle Database Server. The vulnerability impacts supported versions ranging from 23.4.0 to 23.26.0. This vulnerability allows an unauthenticated attacker with logon access to the infrastructure where SQLcl executes to compromise the SQLcl component. Successful exploitation requires human interaction from a person other than the attacker, which adds complexity to the exploitation but does not diminish the potential risk. The CVSS 3.1 base score for this vulnerability is 7.0, indicating significant risks to confidentiality, integrity, and availability.
Organizations should prioritize patching immediately, as the vulnerability can lead to the takeover of SQLcl, potentially allowing unauthorized actions within the database environment.
Given the nature of this vulnerability, it can pose a considerable risk to organizations that utilize Oracle Database Server. The exploitation of this vulnerability could lead to unauthorized access and actions that compromise sensitive data or system integrity.
The urgency of addressing this vulnerability cannot be overstated, as it not only affects system security but also the trustworthiness of the data managed by the affected systems. Organizations are advised to monitor for any signs of exploitation and to ensure that they have the latest patches applied.
Vulnerability Details
The official description of CVE-2026-21939 states that it is a vulnerability in the SQLcl component of Oracle Database Server. Supported versions that are affected include 23.4.0 to 23.26.0. The vulnerability is classified as high severity with a CVSS 3.1 base score of 7.0, reflecting significant impacts on confidentiality, integrity, and availability.
The attack vector for this vulnerability is local, requiring the attacker to have access to the environment where SQLcl operates. The complexity of the attack is classified as high, and no privileges are required to exploit the vulnerability. However, user interaction is required, meaning that an action from a user who is not the attacker is necessary for the attack to be successful.
The potential impacts of successful exploitation include high confidentiality, integrity, and availability impacts, indicating that an attacker could compromise sensitive data, alter data integrity, and affect availability of the SQLcl component.
Technical Analysis
The root cause of this vulnerability lies in the SQLcl component's handling of unauthenticated requests, which, combined with the requirement for human interaction, presents unique challenges for exploitation. Attackers may leverage this vulnerability by crafting a scenario where a user inadvertently engages with the malicious action, allowing the attacker to take control of SQLcl.
The attack vector is local, meaning that access to the system where SQLcl is executed is necessary. The high attack complexity indicates that the exploit is not straightforward and requires specific conditions to be met. No privileges are required to initiate the attack, and user interaction is necessary, which adds an additional layer of complexity to the exploitation process.
The impacts of a successful attack include significant confidentiality, integrity, and availability consequences. Organizations are advised to conduct thorough assessments of their systems to identify any potential vulnerabilities related to SQLcl and to implement immediate remediation strategies.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access and control over SQLcl, which can lead to severe data breaches and operational disruptions. Given that successful exploitation requires human interaction, the attack could be more insidious, potentially leading to a false sense of security among users.
The blast radius of a successful exploit could extend beyond SQLcl itself, potentially affecting other components of the Oracle Database Server. This vulnerability highlights the importance of user awareness and training, as social engineering tactics may be employed to exploit this weakness.
Organizations should address this vulnerability in their priority patch cycle to mitigate risks. The CVSS score of 7.0 indicates a high level of urgency, and immediate action is recommended to safeguard sensitive data and maintain the integrity of database operations.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include all versions of Oracle Database Server from 23.4.0 to 23.26.0. Organizations should ensure that they have applied the appropriate patches to mitigate this vulnerability.
Mitigation & Remediation
Organizations should apply the latest security patches provided by Oracle to remediate this vulnerability. It is crucial to monitor for any updates or advisories related to this CVE and ensure that all systems running the affected versions are promptly updated. In cases where immediate patching is not possible, organizations should implement configuration hardening and network controls to limit access to SQLcl.
For further information on effective security measures, organizations can explore penetration testing services that help identify vulnerabilities before they can be exploited.
Detection Guidance
To detect potential exploitation of CVE-2026-21939, organizations should monitor logs for unusual access patterns to SQLcl, particularly any actions that require user interaction. Behavioral anomalies related to SQLcl execution should also be logged and analyzed.
AppSecure Threat Intelligence Insight
This vulnerability represents a critical security concern for organizations using Oracle Database Server. The nature of the vulnerability, requiring human interaction for successful exploitation, suggests potential for social engineering attacks. Security teams should learn from this incident and enhance user training to recognize and respond to phishing attempts that may target SQLcl.
For further insights on security best practices, organizations can refer to the following resources: vulnerability management program and penetration testing methodology to strengthen overall security posture.
In conclusion, CVE-2026-21939 highlights the ongoing need for robust security measures and user awareness in mitigating risks associated with vulnerabilities in widely used software components.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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