CVE-2026-67100: HCL BigFix Service Management SQLi Flaw

CVE-2026-67100 Overview

CVE-2026-67100 affects HCL BigFix Service Management with two chained weaknesses: a SQL injection flaw [CWE-89] and a cross-tenant data exposure flaw. An authenticated attacker can inject database commands to extract sensitive system details. The same attacker can manipulate request values to access full personal profile data and personally identifiable information (PII) belonging to other organizations sharing the platform.

The combined impact allows database-level data extraction and multi-tenant boundary bypass in a single product. HCL Software has published guidance in a knowledge base article for affected customers.

Critical Impact
Attackers can extract database content through SQL injection and read PII across tenant boundaries, breaking the isolation guarantees of the shared service platform.

Affected Products

HCL BigFix Service Management

Discovery Timeline

2026-09-18 - CVE-2026-67100 published to the National Vulnerability Database
2026-09-18 - Last updated in NVD database

Technical Details for CVE-2026-67100

Vulnerability Analysis

CVE-2026-67100 combines two distinct classes of flaws in HCL BigFix Service Management. The first is a SQL injection weakness [CWE-89] that lets an authenticated user append database commands to backend queries. The second is a cross-tenant authorization flaw that allows request tampering to reach profile and PII records belonging to other organizations.

Because the product operates as a multi-tenant service management platform, both flaws directly undermine tenant isolation. The SQL injection path exposes system-level details stored in shared database structures. The cross-tenant path exposes end-user identity data across organizational boundaries.

The attack surface is reachable over the network and requires no user interaction. Exploitation requires only valid authentication to the service, which is a low bar in shared SaaS-style deployments.

Root Cause

The SQL injection component stems from improper neutralization of special elements used in SQL commands. User-controllable input reaches database query construction without parameterization or strict validation. The cross-tenant exposure stems from missing or insufficient authorization checks on request parameters that identify the target tenant or profile record.

Attack Vector

An authenticated attacker sends crafted HTTP requests to affected BigFix Service Management endpoints. SQL payloads embedded in request parameters are concatenated into backend queries, returning system data outside the caller's intended scope. Separately, attackers modify tenant or profile identifiers in requests to retrieve PII belonging to other customers of the platform.

No verified public exploit is currently available. Refer to the HCL Software Knowledge Base Article for technical remediation details.

Detection Methods for CVE-2026-67100

Indicators of Compromise

Application or database logs containing SQL meta-characters such as ', --, UNION SELECT, or information_schema references in request parameters.
HTTP requests where authenticated users repeatedly change tenant, organization, or profile identifier values in short intervals.
Unexpected outbound responses containing PII fields for tenants the requesting account is not associated with.

Detection Strategies

Enable verbose application logging on BigFix Service Management endpoints handling profile and search queries, and forward logs to a centralized analytics platform.
Correlate authenticated session identifiers with the tenant scope of accessed records to surface cross-tenant reads.
Deploy a web application firewall (WAF) with SQL injection rule sets tuned to the request patterns of BigFix Service Management.

Monitoring Recommendations

Monitor database query logs for unusual query shapes originating from the application service account.
Alert on anomalous spikes in profile record retrievals per authenticated user.
Track failed authorization events and 4xx responses on tenant-scoped endpoints for enumeration behavior.

How to Mitigate CVE-2026-67100

Immediate Actions Required

Review the HCL Software Knowledge Base Article and apply the vendor-supplied fix on all BigFix Service Management instances.
Rotate credentials for any accounts that may have been used to access the platform during the exposure window.
Audit database and application logs for signs of SQL injection or cross-tenant record access.

Patch Information

HCL Software has published remediation guidance in knowledge base article KB0133782. Administrators should follow the vendor instructions to update BigFix Service Management to the fixed release and validate that authorization checks on tenant-scoped endpoints behave as expected after the update.

Workarounds

Restrict network access to BigFix Service Management to trusted administrative networks where feasible.
Enforce least privilege on service accounts that connect the application to its database.
Place a WAF in front of the application with signatures for SQL injection and parameter tampering until the patch is deployed.

bash

# Example WAF rule concept for blocking common SQL injection tokens
# Adapt to your WAF syntax before deployment
SecRule ARGS "@rx (?i)(union(\s|/\*.*\*/)+select|information_schema|--|;--|/\*!)" \
    "id:1026671000,phase:2,deny,status:403,msg:'Possible SQLi against BigFix SM'"