CVE-2026-81560 in aistack
Summary
by MITRE • 08/27/2026
A vulnerability was identified in blackms aistack up to 1.6.1. Affected by this issue is some unknown functionality of the file src/web/server.ts of the component Static File Handler. Such manipulation of the argument req.url leads to path traversal. The attack can be executed remotely. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 08/27/2026
The identified vulnerability resides within the Static File Handler component of BlackMS AI Stack, specifically affecting versions up to 1.6.1. This security flaw is located in the source file src/web/server.ts and stems from improper validation or sanitization of user-supplied input passed via the request URL argument. The core technical issue involves a path traversal vulnerability, which allows an attacker to manipulate the requested resource path to access files and directories that are outside the intended web root directory. This type of flaw typically occurs when application logic fails to properly canonicalize file paths or strip out sequence characters such as dot-dot-slash sequences before processing them against the filesystem.
From a technical perspective, this vulnerability enables remote attackers to read arbitrary files from the server's operating system. By constructing malicious HTTP requests with carefully crafted URL parameters containing path traversal sequences, an attacker can bypass access controls and retrieve sensitive information stored on the host machine. This could include configuration files containing database credentials, private keys, environment variables, or other source code artifacts that were not intended to be exposed through the web interface. The severity of this issue is heightened by the fact that it allows for remote execution without authentication in many default configurations, making it a high-risk vector for initial compromise.
The operational impact of this vulnerability extends beyond simple data leakage. If an attacker can read sensitive configuration files, they may extract credentials or API keys that provide access to other internal services or cloud resources. In more severe scenarios, if the server is configured with additional misconfigurations such as executable file handling in static directories, path traversal could potentially lead to remote code execution. The availability of a public exploit significantly increases the likelihood of automated attacks targeting this specific version range. Attackers often utilize scanners that automatically probe for known vulnerabilities using publicly available proof-of-concept scripts, meaning systems running affected versions are likely under active surveillance and attack attempts even if not explicitly targeted by human adversaries.
Industry standards classify this type of flaw under CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which is part of the broader category of path traversal vulnerabilities. In terms of tactical mapping within the MITRE ATT&CK framework, this vulnerability facilitates several techniques including Discovery and Collection phases where adversaries gather information about the compromised environment. Specifically, it aligns with T1083: File and Directory Discovery, allowing attackers to map out the file system structure for further exploitation. The lack of response from the project maintainers despite early notification via issue reports exacerbates the risk profile, as users are left without official patches or workarounds provided by the vendor.
Mitigation strategies should focus on immediate remediation through version upgrades if a patched release becomes available. In the interim, organizations running BlackMS AI Stack 1.6.1 and earlier must implement compensating controls at the network perimeter. Web Application Firewalls can be configured with rules to detect and block requests containing path traversal sequences such as ../ or encoded variations thereof. Additionally, restricting access to static file directories by ensuring that only intended files are served and disabling directory listing features reduces the attack surface. It is also critical to review server configurations to ensure that sensitive files like .env, config.json, or source code are not placed in publicly accessible web roots. Regular security audits and penetration testing should be conducted to verify that path traversal vectors have been effectively neutralized across all deployed instances of the software.