The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and has access to specific APIs, can restore a volume from any other user's backups and attach the volume to their own VMs. This vulnerability allows unauthorized access to sensitive data, posing a significant risk.
With a CVSS score of 8.1, categorized as high severity, organizations should prioritize patching immediately. The vulnerability's publication date was May 8, 2026, and it affects all versions prior to the vendor patch, which is version 4.22.0.1. Failure to address this issue can lead to severe impacts on confidentiality and integrity.
Risk to organizations includes unauthorized access to user data, impacting trust and compliance requirements. The urgency to remediate this vulnerability should be high, especially in environments heavily reliant on CloudStack for managing backups.
Organizations need to evaluate their current CloudStack deployment and take immediate actions to upgrade to the fixed version. Monitoring and security assessments should be performed to ensure no unauthorized access has occurred.
Vulnerability Details
The vulnerability is classified under CWE-359, which indicates improper access control. It is associated with Apache's CloudStack Backup plugin, which allows unauthorized restoration of backups. The recommended action is to upgrade to CloudStack version 4.22.0.1 for mitigation.
The CVSS 3.1 score breakdown indicates a network attack vector (AV:N), low complexity (AC:L), and low privileges required (PR:L). The impact on confidentiality and integrity is high (C:H, I:H), with no impact on availability (A:N).
Technical Analysis
The root cause of this vulnerability is the improper access logic within the CloudStack Backup plugin. Attackers may leverage this vulnerability by utilizing authenticated user accounts to access and restore backups that do not belong to them.
The attack vector is network-based, requiring no user interaction, and it can be exploited with low complexity due to the flawed access controls. This situation can allow a malicious actor to gain unauthorized access to sensitive information, significantly impacting the confidentiality and integrity of user data.
Risk & Impact Analysis
The real-world deployment risk is considerable, especially for organizations that utilize CloudStack for managing backups. If left unaddressed, this vulnerability could lead to data breaches, where attackers exploit the flaw to gain access to sensitive backups of other users.
The blast radius of this vulnerability is extensive, affecting all users of the Backup plugin in the specified versions. Organizations should assess their operational environment and prioritize remediation actions based on the urgency communicated by the CVSS score and the potential impact on their data integrity.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions are Apache CloudStack 4.21.0.0 and 4.22.0.0. Organizations using these versions should upgrade to version 4.22.0.1 to mitigate this vulnerability. If version information is missing, it is safe to state: 'All versions prior to vendor patch.'
Mitigation & Remediation
Organizations should implement the following measures to mitigate this vulnerability:
1. Upgrade to CloudStack version 4.22.0.1 or later.
2. Review access controls for user accounts to ensure proper restrictions.
3. Conduct security audits and monitoring to detect unauthorized access attempts.
For organizations unable to immediately upgrade, consider implementing network segmentation to limit the potential impact of this vulnerability.
Organizations should validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor the following indicators to detect potential exploitation of this vulnerability:
1. Log entries indicating unauthorized access to backup volumes.
2. Behavioral anomalies in user activities related to backup and restore operations.
3. Network signatures indicative of unauthorized API access attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in the potential for data breaches stemming from improper access controls in cloud environments. Security teams must recognize the patterns of vulnerabilities related to access logic and implement stringent access controls.
Organizations should learn from this incident to enhance their security practices, particularly in managing user access to sensitive resources. A strategic defensive takeaway includes adopting a proactive approach to vulnerability management and regular audits of access controls.
For further insights, organizations can refer to our vulnerability management program and explore best practices outlined in our penetration testing methodology to strengthen your defenses.
Additionally, the importance of continuous monitoring cannot be overstated, as highlighted in our continuous security testing framework discussions.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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