CVE-2026-92213 in a2ui
Summary
by MITRE • 09/16/2026
A vulnerability was detected in a2ui-project a2ui up to 0.10.6. This impacts the function z.any of the file renderers/web_core/src/v0_9/schema/server-to-client.ts of the component Angular Renderer. Performing a manipulation of the argument primaryColor results in injection. The attack is possible to be carried out remotely. The patch is named fb8e85aec78d04e81feb9992a57638ca1ec4dc1b. It is suggested to install a patch to address this issue.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in the a2ui-project, specifically within versions up to 0.10.6 of the Angular Renderer component, represents a significant security risk rooted in improper input validation and sanitization mechanisms. The flaw resides within the z.any function located in the server-to-client schema definition file at renderers/web_core/src/v0_9/schema/server-to-client.ts. This architectural placement indicates that the vulnerability affects the boundary between backend processing and frontend rendering, where data intended for client-side display is processed before being injected into the Document Object Model or executed as script content. The core issue arises from how the primaryColor argument is handled during this transformation process. Instead of strictly validating or encoding the input to ensure it conforms to expected color value formats, the system allows arbitrary manipulation of this parameter, which leads directly to injection vulnerabilities.
From a technical perspective, this flaw aligns with CWE-79, commonly known as Cross-Site Scripting (XSS), specifically in scenarios where user-controllable data is not properly neutralized before being used in web pages. The ability to manipulate the primaryColor argument suggests that an attacker can inject malicious script payloads or other executable code fragments under the guise of a color value. Because this function operates within the context of rendering, any injected content may be interpreted by the browser as active scripting rather than inert data. This misinterpretation allows for the execution of arbitrary JavaScript in the context of the vulnerable application, potentially leading to session hijacking, credential theft, defacement, or further propagation of malware if combined with other vectors such as phishing links embedded within the injected content.
The operational impact of this vulnerability is severe due to its remote exploitability. Since the attack can be carried out remotely without requiring authentication or prior interaction from a legitimate user beyond visiting a maliciously crafted page or link that triggers the vulnerable function, it poses a high risk to any deployment using these affected versions. Attackers could leverage server-side rendering flaws where dynamic content is generated based on untrusted input. If an attacker can control the primaryColor parameter through URL parameters, form submissions, or API calls that feed into this renderer, they can execute code in the victim's browser. This compromises the confidentiality, integrity, and availability of the application for affected users, undermining trust in the platform and potentially exposing sensitive user data stored in local storage or cookies associated with the domain.
Industry standards such as MITRE ATT&CK classify this type of vulnerability under techniques related to Client-Side Injection, specifically T1059 if it involves command execution via script interpretation, though more accurately it falls under web application attack vectors like XSS which are often categorized under initial access or persistence depending on the payload's intent. The lack of proper output encoding and input validation violates fundamental secure coding principles outlined in OWASP Top 10 guidelines regarding injection flaws. Developers must ensure that all dynamic content is properly encoded based on its context within the HTML structure, whether it be attribute value, script block, CSS, or URL contexts.
To mitigate this vulnerability, immediate action should be taken to upgrade the a2ui-project to version 0.10.7 or later, where the patch identified by commit hash fb8e85aec78d04e81feb9992a57638ca1ec4dc1b has been applied. This patch likely introduces rigorous input validation for the primaryColor argument and ensures that any special characters are properly escaped or encoded before being passed to the rendering engine. In addition to upgrading, organizations should implement Web Application Firewalls (WAFs) with rulesets capable of detecting and blocking XSS payloads in real-time as a compensating control while patching is underway. Furthermore, adopting Content Security Policy headers can help mitigate the impact by restricting the sources from which scripts are allowed to execute, thereby reducing the effectiveness of any successful injection attempts even if they occur due to undiscovered flaws or delayed patches.