CVE-2025-52659: HCL AION Information Disclosure Flaw

CVE-2025-52659 Overview

CVE-2025-52659 is an Information Disclosure vulnerability affecting HCL AION version 2. The vulnerability stems from improper handling of cacheable HTTP responses, which may lead to unintended storage of sensitive or dynamic content, potentially resulting in unauthorized access or information disclosure.

Critical Impact

Sensitive or dynamic content may be cached inappropriately, potentially exposing confidential information to unauthorized users who access cached responses.

Affected Products

• HCL AION version 2

Discovery Timeline

• 2026-01-19 - CVE CVE-2025-52659 published to NVD
• 2026-01-19 - Last updated in NVD database

Technical Details for CVE-2025-52659

Vulnerability Analysis

This vulnerability is classified under CWE-525 (Use of Web Browser Cache Containing Sensitive Information). The core issue involves the application failing to properly configure HTTP response headers to prevent caching of sensitive content. When dynamic or sensitive responses are cached, subsequent users may retrieve this data from the cache rather than receiving fresh, user-specific content.

The vulnerability requires local access to exploit, necessitating an authenticated user with low privileges and some user interaction. While the direct impact is limited to availability concerns, the broader security implication involves potential exposure of sensitive information through cached responses that should have been marked as non-cacheable.

Root Cause

The root cause lies in improper implementation of cache control directives in HTTP responses. The HCL AION version 2 application does not adequately set cache-control headers such as Cache-Control: no-store, Cache-Control: no-cache, or Pragma: no-cache for responses containing sensitive or dynamically generated content. This oversight allows web browsers and intermediate caching proxies to store responses that should remain private.

Attack Vector

The attack vector is local in nature. An attacker with access to the same system or browser cache as a legitimate user could potentially retrieve cached sensitive information. This could occur through:

• Accessing a shared workstation where a previous user's session data remains cached
• Exploiting browser cache contents on a compromised endpoint
• Leveraging intermediate proxy caches in environments where response caching is enabled

The exploitation scenario requires the attacker to have local access to either the user's browser cache or a shared caching infrastructure that stores the vulnerable responses.

Detection Methods for CVE-2025-52659

Indicators of Compromise

• Presence of sensitive data in browser cache directories for HCL AION version 2 application responses
• HTTP responses from HCL AION lacking appropriate Cache-Control or Pragma headers
• Evidence of cached dynamic content in proxy logs that should be unique per session

Detection Strategies

• Audit HTTP response headers from HCL AION version 2 endpoints to verify proper cache control directives are in place
• Review web application firewall (WAF) logs for responses missing Cache-Control: no-store headers on sensitive endpoints
• Implement automated security scanning to detect missing cache control configurations

Monitoring Recommendations

• Monitor for unusual access patterns to cached resources that may indicate exploitation attempts
• Implement logging for cache hits on endpoints known to serve sensitive content
• Enable alerting on proxy servers when sensitive content paths are served from cache

How to Mitigate CVE-2025-52659

Immediate Actions Required

• Review all HTTP responses from HCL AION version 2 for proper cache control headers
• Configure responses containing sensitive data to include Cache-Control: no-store, no-cache, must-revalidate headers
• Ensure Pragma: no-cache is set for backward compatibility with HTTP/1.0 clients
• Clear existing browser and proxy caches that may contain sensitive cached content

Patch Information

HCL Software has published information regarding this vulnerability. Organizations should consult the HCL Software Knowledge Base Article for official guidance, patches, and recommended remediation steps specific to HCL AION version 2 deployments.

Workarounds

• Configure web server or reverse proxy to add appropriate cache control headers to all responses from HCL AION
• Implement a web application firewall (WAF) rule to inject Cache-Control: no-store headers on sensitive endpoints
• Restrict access to shared workstations and enforce browser cache clearing on logout
• Consider network segmentation to limit exposure of cached content to potential attackers

# Example Apache configuration to prevent caching of sensitive responses
<Location "/aion/sensitive/">
    Header set Cache-Control "no-store, no-cache, must-revalidate"
    Header set Pragma "no-cache"
    Header set Expires "0"
</Location>