CVE-2026-92217 in a2ui
Summary
by MITRE • 09/16/2026
A vulnerability was determined in a2ui-project a2ui up to 0.10.6. This affects the function processMessages of the file renderers/web_core/src/v0_9/processing/message-processor.ts of the component Message Parsing. This manipulation causes dynamically-determined object attributes. The attack can be initiated remotely. The project was informed of the problem early through an issue report but has not responded yet.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in a2ui versions up to 0.10.6 represents a significant security risk within the Message Parsing component, specifically located in the processMessages function found at renderers/web_core/src/v0_9/processing/message-processor.ts. This flaw is categorized as an insecure direct object reference or dynamic attribute manipulation vulnerability, which falls under the Common Weakness Enumeration (CWE) category of CWE-20: Improper Input Validation and potentially CWE-755: Incorrect Handling of Special Elements in Queries depending on the specific implementation details of how attributes are resolved. The core technical issue stems from the application's failure to properly validate or sanitize input data before using it to determine object attributes dynamically. When a user provides input that is intended to specify an attribute, the system fails to restrict this input to a predefined whitelist of safe values, allowing attackers to inject arbitrary property names into the processing logic.
This architectural weakness allows for remote exploitation without requiring prior authentication in many configurations, classifying it under MITRE ATT&CK technique T1059: Command and Control or potentially T1190: Exploit Public-Facing Application if the manipulation leads to broader system compromise. The attack vector is initiated remotely by sending specially crafted messages to the a2ui service. Because the processMessages function handles incoming data streams, an attacker can manipulate these streams to include malicious attribute identifiers. When the application processes these messages, it interprets the injected attributes as legitimate object properties rather than rejecting them or treating them as invalid input. This lack of strict validation enables the manipulation of internal state objects, potentially leading to unauthorized access to sensitive data stored within those objects or causing unexpected behavior in the rendering engine that could be leveraged for further attacks such as cross-site scripting if the manipulated attributes are subsequently rendered into HTML output without proper encoding.
The operational impact of this vulnerability is severe due to its remote nature and the critical role message processing plays in web application frameworks like a2ui. If an attacker successfully exploits this flaw, they may achieve unauthorized read access to internal object states that were not intended for public consumption. In more complex scenarios involving prototype pollution or similar inheritance-based vulnerabilities often associated with dynamic attribute manipulation, the impact could escalate to remote code execution if the manipulated attributes trigger specific getter/setter chains within JavaScript engines. The fact that the project has been informed via an issue report but has not yet responded indicates a potential window of exposure where systems running vulnerable versions remain unprotected against active exploitation attempts by threat actors scanning for known weaknesses in popular web components.
Mitigation strategies must focus on immediate remediation and defensive coding practices until an official patch is released by the maintainers. The primary technical fix involves implementing strict input validation within the processMessages function to ensure that any attribute names used during object manipulation are checked against a whitelist of allowed values rather than accepting arbitrary strings. Developers should also consider using immutable data structures or deep cloning mechanisms when processing external inputs to prevent prototype pollution attacks, which often accompany dynamic property injection flaws. Additionally, implementing Content Security Policy headers and ensuring proper output encoding can mitigate the downstream effects if an attacker manages to inject malicious content through these manipulated attributes. Organizations relying on a2ui versions prior to 0.10.6 should monitor for official updates from the project maintainers and consider isolating affected services behind web application firewalls that can detect and block anomalous message patterns indicative of this exploitation technique until the vulnerability is fully patched in subsequent releases.