CVE-2026-35112 in AION
Summary
by MITRE • 11/06/2026
HCL AION is affected by a vulnerability where the Cross-Origin-Embedder-Policy (COEP) header was missing or insecure, so embedded cross-origin resources were not required to explicitly grant permission. This weakens cross-origin isolation, potentially resulting in unintended behavior or security impact under certain conditions.
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Analysis
by VulDB Data Team • 11/06/2026
The identified vulnerability in HCL AION stems from a misconfiguration of the Cross-Origin-Embedder-Policy header, which is a critical component for establishing browser-level cross-origin isolation. This policy directive instructs user agents to restrict how resources are loaded and whether they can access sensitive APIs that require isolated contexts. When this header is missing or configured with an insecure value such as unsafe-none, the application fails to enforce strict boundaries between different origins. Consequently, embedded cross-origin resources do not need to explicitly grant permission via headers like Cross-Origin-Resource-Policy for their content to be accessible by the parent document under certain conditions. This lack of enforcement undermines the security model designed to prevent data leakage and side-channel attacks that rely on shared browser contexts.
From a technical perspective, the absence or weakness of this header prevents the application from achieving cross-origin isolation status in modern web browsers. Cross-origin isolation is essential for unlocking high-privilege features such as SharedArrayBuffer, which allows for multi-threaded JavaScript execution but requires strict security guarantees to prevent timing attacks and Spectre-like vulnerabilities. Without proper isolation, the browser may allow scripts from different origins to interact in ways that were not intended by the developers. This can lead to unintended behavior where sensitive data stored in memory or accessed through high-precision timers becomes observable by malicious cross-origin scripts. The vulnerability essentially creates a gap in the same-origin policy enforcement at the resource loading level, allowing potentially hostile content to probe the application's state more effectively than if isolation were enforced.
The operational impact of this weakness is primarily centered around information disclosure and potential privilege escalation through side-channel attacks. An attacker could exploit the lack of cross-origin isolation to perform timing-based attacks against cryptographic operations or other time-sensitive functions within HCL AION. By measuring how long specific requests take to complete, an adversary might infer sensitive data such as authentication tokens, session identifiers, or proprietary business logic details. Furthermore, in environments where multiple applications are hosted on the same domain but different subdomains, this vulnerability could allow one application to inadvertently access resources from another if those resources do not explicitly deny cross-origin access. This weakens the overall security posture of the deployment and increases the attack surface for web-based exploits that target browser-specific features.
To mitigate this risk, it is imperative to configure the Cross-Origin-Embedder-Policy header with a strict value such as require-corp or at minimum same-origin depending on the application's architecture and resource dependencies. This ensures that all embedded resources must explicitly opt-in via appropriate CORS headers before they can be loaded by the main document. Additionally, organizations should implement Content-Security-Policy directives to further restrict script sources and frame ancestors, providing defense in depth against cross-site scripting and clickjacking attacks that might leverage this isolation weakness. Regular security audits and automated scanning for missing or misconfigured HTTP security headers are recommended to maintain compliance with industry standards such as OWASP Secure Headers Project guidelines. Aligning these configurations with CWE-1021 Improper Restriction of Rendered UI Elements or Input, specifically regarding cross-origin resource sharing policies, will help ensure that the application maintains robust isolation boundaries and protects against modern web-based threats.