CVE-2025-15634 Overview
CVE-2025-15634 is a missing authorization vulnerability in HCL BigFix WebUI. An authenticated user without proper permissions can view sensitive environmental information by accessing a restricted page directly via its URL. The flaw is tracked under CWE-862: Missing Authorization and affects more than twenty BigFix WebUI components, including the API, framework, MDM, patch, query, and reports modules. The vulnerability requires network access and low-privileged authentication, with no user interaction needed.
Critical Impact
Authenticated low-privilege users can bypass authorization checks and access sensitive environmental data across the BigFix WebUI, undermining role-based access controls in enterprise endpoint management deployments.
Affected Products
- HCL BigFix WebUI API, Framework, and Common components
- HCL BigFix WebUI MDM, Patch, Patch Policies, and Software Distribution modules
- HCL BigFix WebUI Query, Reports, Insights, SCM, Take Action, Profile Management, Permissions and Preferences, Application Administration, CMEP, Content App, Custom, Data Sync, Extensions, and IVR modules
Discovery Timeline
- 2026-05-09 - CVE-2025-15634 published to NVD
- 2026-05-14 - Last updated in NVD database
Technical Details for CVE-2025-15634
Vulnerability Analysis
The vulnerability resides in the authorization layer of the HCL BigFix WebUI. BigFix WebUI is the browser-based management interface for the BigFix endpoint management platform, used to deploy patches, run queries, and administer managed devices across an enterprise. The WebUI enforces role-based access control to restrict which users can view configuration and environmental data.
In affected builds, certain pages do not consistently validate the requester's permissions before returning content. An authenticated user who navigates directly to a restricted URL receives sensitive environmental information that should be limited to privileged roles. The exposure is confined to confidentiality. Integrity and availability of the WebUI are not impacted according to the CVSS vector.
Root Cause
The root cause is a missing server-side authorization check [CWE-862]. The application authenticates the session but fails to verify whether the authenticated principal holds the role required to view the target page. Authorization logic is enforced only at the navigation or UI layer, leaving direct URL requests unprotected. This is a classic broken access control pattern where client-side hiding of menu items is mistaken for server-side enforcement.
Attack Vector
Exploitation requires a valid low-privileged BigFix WebUI account and network access to the management console. An attacker with such an account issues an HTTP GET request directly to the URL of a restricted page. The server returns environmental data without verifying permissions. No specialized tooling, user interaction, or elevated privileges are required. Insider threats and attackers who have compromised any low-privilege BigFix account are the most realistic exploitation scenarios. The EPSS score of 0.024% reflects low observed exploitation interest, but the simplicity of the attack means risk increases significantly once a foothold exists.
No public proof-of-concept code or verified exploit examples are available. Refer to the HCL Software Knowledge Base Article for vendor-specific technical details.
Detection Methods for CVE-2025-15634
Indicators of Compromise
- Successful HTTP 200 responses to restricted WebUI page URLs from accounts whose roles should not have access
- WebUI audit log entries showing direct URL navigation that bypasses normal menu-driven workflows
- Anomalous read access to environmental configuration endpoints by non-administrative users
Detection Strategies
- Review BigFix WebUI access logs for authenticated requests to administrative or environmental pages issued by users outside the intended role set
- Correlate session identifiers with role assignments to flag requests where the requested resource exceeds the user's authorized scope
- Hunt for repeated direct URL requests to WebUI endpoints that lack a preceding referer from the main navigation
Monitoring Recommendations
- Forward BigFix WebUI HTTP access and audit logs to a centralized SIEM for retention and correlation
- Build alerts on access patterns where low-privileged accounts touch endpoints normally used by administrators
- Track session activity for accounts that show sudden interest in configuration, MDM, or patch policy pages outside their job function
How to Mitigate CVE-2025-15634
Immediate Actions Required
- Apply the fix referenced in the HCL Software Knowledge Base Article KB0130587 to all BigFix WebUI components listed as affected
- Audit BigFix WebUI user accounts and remove or downgrade any accounts that no longer require access
- Rotate credentials for any low-privileged BigFix accounts suspected of misuse
Patch Information
HCL has published remediation guidance for CVE-2025-15634 in HCL Knowledge Base Article KB0130587. Administrators should upgrade every affected WebUI component, since the vulnerability spans the API, framework, and individual application modules. Patch all twenty-one listed modules together to avoid partial coverage.
Workarounds
- Restrict network access to the BigFix WebUI to trusted administrative networks using firewall rules or VPN gating
- Enforce least-privilege role assignments and remove unused BigFix WebUI accounts until patching is complete
- Enable verbose audit logging on the WebUI and review logs daily for unauthorized access attempts
# Example: restrict BigFix WebUI access to a management subnet using iptables
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
