CVE-2026-67100: HCL BigFix SQL Injection
TL;DR - CVE-2026-67100 affects HCL BigFix Service Management through SQL injection and cross-tenant data exposure. - An authenticated attacker may extract system data or access profile and PII data belonging to other organizations. - CVSS is 9.8. No credible public PoC or confirmed active exploitation was identified, but exact patch details remain unconfirmed.
Vulnerability at a Glance
CVE-2026-67100 is a critical HCL BigFix Service Management vulnerability involving SQL injection and potential cross-tenant data exposure. The available NVD record assigns the issue a critical CVSS base score of 9.8. However, the retrieved NVD content did not include the CVSS vector, so the individual score components must be confirmed against the live NVD record or HCL’s advisory before formal risk modeling.
| Field | Assessment |
|---|---|
| CVE ID | CVE-2026-67100 |
| CVSS base score | 9.8, according to NVD |
| CVSS vector | Not available in the reviewed NVD response; confirm with NVD or HCL |
| Attack vector | Not published in the available record |
| Authentication | Authenticated attacker required, according to the vulnerability description |
| Patch available | Not established from the reviewed sources |
| Affected versions | Not exposed in the reviewed NVD or HCL page content |
| Fixed version | Not established |
| CISA KEV status | Not listed as of the assessment date |
| Public PoC | No credible CVE-specific PoC identified |
| Active exploitation | No confirmed in-the-wild exploitation identified |
The absence of a confirmed fixed version should not be interpreted as evidence that no remediation exists. HCL’s support bulletin, KB0133782, is the authoritative source for release-specific remediation, but the retrieved page content exposed only the support portal shell and not the bulletin’s substantive version details.
What Is CVE-2026-67100?
The NVD description states that HCL BigFix Service Management is affected by an SQL injection flaw and a cross-tenant data exposure flaw. An authenticated attacker may be able to inject database commands, extract sensitive system information, and manipulate request values to obtain complete personal-profile data and personally identifiable information associated with other organizations.
SQL injection generally occurs when application-controlled values are incorporated into database queries without adequate parameterization or validation. The available records do not identify the vulnerable endpoint, parameter, database engine, query, or exploitation sequence. Defenders should therefore not assume that filtering a single known parameter or blocking one SQL keyword is a complete mitigation.
The cross-tenant impact is especially significant for service-management deployments that host data for multiple organizations or business units. If tenant isolation is enforced at the application layer and request values can alter the tenant context, an authenticated user could potentially retrieve records outside the user’s authorized organization. The description does not establish whether the issue affects every authenticated role or only specific roles, workflows, or API clients.
Technical Notes
The reported impact has two distinct investigation tracks:
- Database monitoring: Look for abnormal query behavior, errors, or access patterns associated with the service-management application.
- Application monitoring: Identify requests in which tenant, organization, profile, or record identifiers change unexpectedly.
Do not reproduce the issue against production systems without authorization. The available material does not provide a safe test payload, and testing against shared tenant data could create additional confidentiality or integrity risk.
Who Is Affected?
The affected product is HCL BigFix Service Management. The available NVD result and retrieved HCL advisory response do not expose an affected version range. No responsible version boundary can therefore be quoted from the supplied evidence.
The fixed version is also not established. Organizations running HCL BigFix Service Management should treat their deployments as potentially affected until the HCL bulletin or HCL Support provides a version-specific determination. This includes self-hosted installations, managed environments where the customer controls application configuration, and integrations that submit authenticated requests to the service-management application.
| Product | Affected versions | Fixed version |
|---|---|---|
| HCL BigFix Service Management | Not published in the reviewed records | Not established |
Because the issue may permit access to data belonging to other organizations, exposure should be assessed at the deployment level rather than only by counting vulnerable hosts. A single internet-accessible or broadly reachable instance may represent a larger confidentiality risk if it serves multiple tenants.
CVSS Score Breakdown
NVD assigns CVE-2026-67100 a base score of 9.8, placing it in the critical severity category. The available NVD response did not include the vector string. Without that vector, the exact values for attack vector, attack complexity, privileges required, user interaction, scope, confidentiality, integrity, and availability cannot be stated reliably.
The description does indicate that an attacker must be authenticated. That fact is relevant to access control and triage, but it is not sufficient to reconstruct the CVSS vector. Authentication may involve different privilege levels, and the distinction between a normal user and an administrator can materially affect scoring. The record also does not establish whether exploitation changes the security authority or scope from one tenant to another for CVSS purposes.
Defenders should use 9.8 for prioritization because it is the published NVD base score, while avoiding unsupported claims about the vector components. Confirm the vector directly in the current NVD record and HCL advisory before importing the score into governance, vulnerability-management, or insurance reporting systems.
Exploitation Status
CVE-2026-67100 was not listed in the CISA Known Exploited Vulnerabilities catalog at the assessment date of September 18, 2026. No CISA KEV date, due date, required action, or ransomware-campaign flag was available.
No credible, CVE-specific public proof of concept was identified in the reviewed search results. Generic collections that mention 2026 vulnerabilities, or references to unrelated HCL or SQL injection issues, are not evidence of a working exploit for this CVE. Similarly, no confirmed in-the-wild exploitation was identified from the sources checked.
This status means exploitation is unconfirmed, not impossible. A KEV non-listing does not prove that exploitation has not occurred, and the absence of a public PoC does not eliminate the possibility of private research or targeted abuse. Organizations should prioritize according to exposure, tenant sensitivity, authentication risk, and the critical CVSS rating.
How to Detect CVE-2026-67100
Detection should focus on authenticated activity that is inconsistent with a user’s normal tenant scope, unusual request manipulation, and database behavior originating from the BigFix Service Management application. Review authentication, web or API gateway, application, database, and data-access logs together. Correlation is important because an individual request may not appear malicious in isolation.
Look for:
- Repeated changes to tenant or organization identifiers
- Requests for profile records outside the user’s assigned organization
- Database errors following unusual parameter values
- Access to unusually large numbers of personal records
- Authenticated users accessing multiple tenant identifiers in a short period
Preserve relevant logs before rotating them, including source addresses, authenticated identities, request IDs, endpoint paths, status codes, response sizes, and database audit events.
Technical Notes
A generic web or API log search can identify common indicators for triage, but it is not proof of exploitation:
grep -Eai \
'(%27|%22|%3[Bb]|union([+%20]|%20)+select|select([+%20]|%20)+.*from|information_schema|sleep[(]|benchmark[(]|or[+%20]+1=1)' \
/var/log/nginx/access.log /var/log/apache2/access.log
Adapt the paths and encoding rules to the deployed reverse proxy. This pattern will produce false positives and should not be used as a blocking rule without testing. It is intended to locate requests for analyst review.
For identity and tenant-boundary monitoring, a SIEM query should alert when one authenticated principal accesses multiple organization identifiers in a short period. The following pseudocode illustrates the required logic and must be mapped to the organization’s actual field names:
FROM application_logs
WHERE action IN ("profile_read", "personal_data_read", "request_read")
GROUP BY authenticated_user, 15m
HAVING distinct(tenant_id) > 1
OR count_distinct(target_profile_id) > baseline_for_user
Database logs should also be checked for application-originated errors containing terms such as syntax error, SQLSTATE, unterminated, or invalid column, especially when they correlate with unusual authenticated requests. These patterns are investigative signals, not confirmed CVE-specific signatures.
Mitigation and Patching
The exact affected version range and fixed version were not available in the reviewed NVD result or retrieved HCL support page. Obtain the complete content of HCL Security Bulletin KB0133782 through HCL Support and verify the vendor’s required upgrade or hotfix before scheduling remediation. Do not select a target version based only on the CVSS score or an assumed current release.
Until HCL confirms the applicable fixed release, restrict access to the application where operationally possible. Limit administrative and user access to approved networks, VPNs, or identity-aware gateways. Review tenant permissions, remove unnecessary accounts, enforce strong authentication, and prevent shared or overprivileged service identities from accessing the platform.
Organizations reviewing privileged-account exposure during remediation may also consider a password manager such as Try 1Password →, provided it fits their identity, access-control, and compliance requirements.
Technical Notes
A concrete compensating control is to place the service behind an allowlist at the reverse proxy. The example below restricts access to an internal network and should be adapted to the organization’s approved management ranges:
location / {
allow 10.20.0.0/16;
allow 192.0.2.10/32;
deny all;
proxy_pass http://bigfix_service_management;
}
After validating the configuration, reload the proxy:
sudo nginx -t && sudo systemctl reload nginx
This is an exposure-reduction measure, not a fix for the vulnerability. Do not deploy a generic SQL keyword-blocking rule as the primary workaround because encoding variations and legitimate application traffic can bypass or defeat such filters. If the application cannot be restricted, use an authenticated gateway, narrowly scoped firewall policy, and enhanced request and database monitoring while awaiting HCL’s version-specific instructions.
After applying the HCL-provided update or hotfix:
- Verify the installed product version using the product’s supported administration interface or vendor-documented inventory method.
- Test authentication and tenant isolation.
- Test integrations and profile-data access.
- Review logs from the period before remediation for evidence of cross-tenant reads or abnormal database activity.
- Consider a cybersecurity tabletop exercise to validate escalation, containment, and notification procedures if sensitive tenant data may have been accessed.
References
The primary record is the NVD entry for CVE-2026-67100: NVD CVE-2026-67100. It supplies the CVE description and reported 9.8 base score, but the reviewed response did not provide the CVSS vector, affected versions, or fixed version.
The vendor reference is HCL’s security bulletin KB0133782, titled “Security Bulletin: Multiple security vulnerabilities affect HCL BigFix Service Management”: HCL Support KB0133782. Consult the fully rendered or authenticated bulletin for authoritative product-version and remediation guidance.
For exploitation prioritization, consult the CISA Known Exploited Vulnerabilities Catalog. CVE-2026-67100 was not listed in the catalog at the time of assessment. Recheck the catalog because membership and exploitation intelligence can change after publication.
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