CVE-2026-82881 in Aix-DB
Summary
by MITRE • 08/31/2026
Aix-DB through 1.2.4 renders markdown with raw HTML enabled into v-html bindings without sanitization, allowing stored cross-site scripting attacks. Attackers can inject malicious HTML and JavaScript through markdown content in chat responses, skill descriptions, or knowledge messages that execute in users' browsers when viewed.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/31/2026
The vulnerability identified in Aix-DB versions 1.2.4 and earlier represents a critical security flaw rooted in the improper handling of user-supplied input within its Markdown rendering engine. Specifically, the application allows raw HTML content to be processed directly into Vue.js v-html bindings without applying any form of sanitization or validation. This architectural decision bypasses standard browser-level protections that typically restrict the execution of scripts embedded in untrusted data sources. By enabling this feature by default and failing to strip potentially dangerous tags such as script, iframe, or event handlers like onerror, the system creates a direct pathway for attackers to inject malicious code into the application's output stream. This flaw fundamentally undermines the trust boundary between user input and server-rendered content, allowing external actors to manipulate what is displayed to legitimate users in real-time.
The operational impact of this vulnerability is severe due to its classification as a stored cross-site scripting attack vector. Unlike reflected XSS where malicious links must be clicked by victims, stored vulnerabilities persist on the target system, often within databases or persistent storage mechanisms. In the context of Aix-DB, attackers can inject their payloads through various entry points including chat responses, skill descriptions, and knowledge messages. Once this content is saved to the backend, it becomes part of the application's state. Consequently, every subsequent user who views these specific sections will have the malicious JavaScript executed in their browser session under the context of the Aix-DB domain. This persistence ensures that the attack does not require social engineering tactics like phishing links; simply accessing a compromised page is sufficient to trigger the exploit, leading to widespread potential compromise across all active users interacting with the affected content types.
From an industry standards perspective, this vulnerability aligns closely with CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting (XSS). The specific mechanism involves a failure to sanitize dynamic HTML output, which also maps to CWE-80 in cases where the input is not properly validated before being written to the DOM. Furthermore, within the MITRE ATT&CK framework, this behavior corresponds to techniques associated with Client-side Injection and potentially T1059 Command and Scripting Interpreter if the injected scripts are used to execute further commands or exfiltrate data. The lack of Content Security Policy enforcement or output encoding exacerbates the risk, allowing attackers to bypass default browser security models that would otherwise mitigate such injection attempts in more rigorously secured applications.
Mitigation strategies for this vulnerability must prioritize immediate input validation and robust output sanitization. Developers should implement a comprehensive HTML sanitizer library capable of stripping all non-whitelisted tags and attributes before rendering content via v-html bindings. It is critical to avoid using v-html or similar direct DOM manipulation methods with untrusted data; instead, developers should rely on Vue's default text interpolation which automatically escapes HTML entities. If raw HTML rendering is strictly necessary for legitimate use cases, a strict allowlist of safe tags and attributes must be enforced server-side before the content reaches the client. Additionally, implementing Content Security Policy headers can provide an additional layer of defense by restricting script execution sources, although this should not replace proper input sanitization as it serves only as a secondary control mechanism to limit the blast radius of any remaining vulnerabilities.