CVE-2025-56534 is a medium-severity cross-site scripting (XSS) vulnerability in the custom authenticator driver of OpenNebula v6.10.0.1. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload, which poses a significant risk to users' data and web application integrity. With a CVSS score of 6.1, it falls within the medium severity range, indicating a notable risk that organizations should not underestimate.
Organizations using OpenNebula should be aware that this vulnerability could be exploited by attackers with low privileges and minimal user interaction. The attack vector is network-based, allowing for remote exploitation, which underscores the importance of addressing this issue promptly. Given the nature of XSS vulnerabilities, the potential for data confidentiality and integrity impacts makes this a pressing concern.
Risk to organizations includes unauthorized access and manipulation of user data. Attackers may leverage this vulnerability to perform actions on behalf of legitimate users, leading to compromised systems and data breaches. Therefore, organizations should prioritize patching immediately.
Currently, there is no known exploit available in public databases, and while a proof-of-concept (PoC) has been found on GitHub, it is essential for organizations to maintain vigilance against potential attacks. Implementing mitigation strategies and keeping systems updated are crucial steps in defending against this vulnerability.
With the vulnerability disclosed on April 29, 2026, organizations need to act swiftly to protect their systems, as the longer a vulnerability remains unpatched, the greater the risk of exploitation becomes.
Vulnerability Details
The CVE-2025-56534 vulnerability is characterized by its ability to allow attackers to execute arbitrary web scripts or HTML. The official CVE description highlights that this issue is specifically related to the custom authenticator driver in OpenNebula v6.10.0.1. The vulnerability is classified as CWE-79, indicating its nature as an XSS vulnerability.
The vulnerability has a CVSS score of 6.1, classified as medium severity. This score is derived from various factors, including an attack vector of network access, low attack complexity, no required privileges, and a requirement for user interaction.
The affected product is OpenNebula, specifically versions prior to 7.0.0. As of the last modification date, the vulnerability remains analyzed, indicating that further research may still be ongoing.
Technical Analysis
The root cause of CVE-2025-56534 lies in improper validation of user input in the custom authenticator driver, which allows malicious users to inject scripts into web pages viewed by other users. The attack vector is network-based, and exploitation can be carried out remotely without requiring any privileges. However, it does require user interaction, such as clicking on a link that contains the crafted payload.
The attack complexity is rated as low, making it easier for attackers to exploit this vulnerability. The impacts on confidentiality and integrity are classified as low, while availability is unaffected.
Risk & Impact Analysis
Real-world deployment of OpenNebula with this vulnerability poses a significant risk. Attackers can exploit this flaw to execute scripts that could lead to unauthorized actions performed on behalf of legitimate users. This not only compromises user data but could also lead to further exploits within the organization’s internal systems.
The potential blast radius is considerable, as this vulnerability may affect all users interacting with the system, particularly those with elevated privileges or sensitive information. Organizations utilizing OpenNebula must assess the urgency of remediation based on the medium CVSS score and the potential for exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of OpenNebula prior to 7.0.0 are affected by this vulnerability. Organizations should ensure that they are operating with the latest version to mitigate potential risks.
Mitigation & Remediation
To remediate CVE-2025-56534, organizations must upgrade to OpenNebula version 7.0.0 or later. This update should include all security patches to ensure that known vulnerabilities are addressed. If immediate patching is not possible, organizations should implement security best practices, including input validation and sanitization to mitigate XSS risks.
Additionally, organizations may benefit from conducting regular security assessments, such as penetration testing, to identify and remediate vulnerabilities proactively.
Detection Guidance
To detect potential exploitation of CVE-2025-56534, organizations should monitor logs for unusual behavior related to user input handling. This includes tracking anomalies in web requests that may indicate script injections. Implementing security information and event management (SIEM) tools can assist in identifying and alerting on these indicators.
AppSecure Threat Intelligence Insight
CVE-2025-56534 represents a significant risk for users of OpenNebula, particularly in environments where web applications are heavily relied upon. The pattern of XSS vulnerabilities remains a common attack vector, highlighting the need for robust security measures. Organizations are encouraged to adopt a proactive approach to vulnerability management, ensuring timely updates and comprehensive security assessments.
Security teams should also consider the long-term implications of such vulnerabilities, as they often lead to broader security breaches. Developing a vulnerability management program can help mitigate these risks effectively.
Ultimately, organizations must remain vigilant and adapt to the evolving threat landscape, ensuring that security practices are up to date and capable of addressing new vulnerabilities as they arise.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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