CVE-2025-56536
Stored XSS in OpenNebula v6.10.0.1
Publication date: 2026-04-29
Last updated on: 2026-04-30
Assigner: MITRE
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| opennebula | opennebula | to 7.0.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a stored cross-site scripting (XSS) issue found in opennebula version 6.10.0.1. It allows attackers to inject malicious web scripts or HTML code by inserting a specially crafted payload into the user information parameter. When this malicious code is stored and later viewed by other users, it can execute in their browsers.
How can this vulnerability impact me? :
The impact of this vulnerability is that attackers can execute arbitrary scripts in the context of the affected web application. This can lead to unauthorized actions such as stealing user session cookies, defacing web content, redirecting users to malicious sites, or performing actions on behalf of other users without their consent.
Can you explain this vulnerability to me?
CVE-2025-56536 is a stored cross-site scripting (XSS) vulnerability in OpenNebula versions prior to 7.0. It occurs in the opennebula-sunstone component, specifically in the user information parameter. An attacker can inject a crafted malicious payload, such as a script or HTML code, which is then stored and executed in the context of a user's session when the application processes this data.
This means that when a user views or interacts with the affected component, the injected script runs in their browser, potentially allowing the attacker to perform unauthorized actions or steal sensitive information.
How can this vulnerability impact me? :
This vulnerability can allow attackers to execute arbitrary JavaScript code within the context of a user's session in OpenNebula. The impact includes the potential theft of user credentials, session hijacking, unauthorized actions performed on behalf of the user, and the compromise of sensitive information.
Because the vulnerability is a stored XSS, the malicious payload persists and affects multiple users who access the compromised user information parameter.
The CVSS v3.1 base score of 6.1 indicates a medium severity with network attack vector, low attack complexity, no privileges required, but user interaction needed, and partial impact on confidentiality and integrity.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by testing the user information parameter in the OpenNebula Sunstone interface for stored cross-site scripting (XSS) payloads. Specifically, injecting a crafted payload such as `<image src =q onerror=prompt(8)>` into the user information parameter and observing if the script executes when the data is rendered indicates the presence of the vulnerability.
There are no specific network or system commands provided to detect this vulnerability automatically. Detection typically involves manual or automated security testing tools that can inject and detect XSS payloads in web application parameters.
What immediate steps should I take to mitigate this vulnerability?
The immediate and recommended mitigation step is to upgrade OpenNebula to version 7.0 or later, as this version includes fixes that address the stored XSS vulnerability in the user information parameter.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The stored cross-site scripting (XSS) vulnerability in OpenNebula versions prior to 7.0 allows attackers to execute arbitrary scripts in the context of a user's session by injecting malicious payloads into the user information parameter.
Such vulnerabilities can lead to unauthorized access to user data or session hijacking, which may result in breaches of confidentiality and integrity of personal or sensitive information.
Consequently, this vulnerability could impact compliance with data protection regulations like GDPR and HIPAA, which require organizations to protect user data against unauthorized access and ensure secure handling of personal information.
Mitigating this vulnerability by upgrading to OpenNebula version 7.0 or later is recommended to maintain compliance and reduce the risk of data breaches.