Summary
CVE-2026-67101 is a critical Server-Side Request Forgery (SSRF) vulnerability affecting the search functionality of HCL BigFix Service Management. An unauthenticated, network-based attacker can abuse the flaw to force the application server into issuing requests on their behalf, potentially reaching internal systems that are otherwise not reachable from the internet. The vulnerability carries a CVSS v3.1 base score of 9.3 (Critical), reflecting its low complexity, lack of privilege requirements, and potential for significant confidentiality impact.
Technical details
- Root cause: The search feature in HCL BigFix Service Management fails to properly validate or restrict user-supplied input (such as URLs or hostnames) before the application server uses it to initiate outbound requests, resulting in a classic SSRF condition (CWE-918).
- Trigger conditions: An attacker submits a crafted request to the search functionality that causes the backend server to make an HTTP(S) request to a destination of the attacker’s choosing.
- Attack vector: Network-based, requiring no authentication (PR:N) and no user interaction (UI:N), with low attack complexity (AC:L).
- Impact: Because the request originates from the trusted application server, an attacker can pivot to internal-only systems and services that are not exposed to the public internet, potentially exposing sensitive data (high confidentiality impact) and enabling limited unauthorized modification (low integrity impact). The vulnerability’s scope is "Changed" (S:C), meaning impact extends beyond the vulnerable component itself.
Affected software
- HCL BigFix Service Management V23
Severity
- CVSS v3.1 Base Score: 9.3 (Critical)
- Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Mitigation and recommended actions
- Immediate: Apply the fix provided by HCL Software for HCL BigFix Service Management V23, as documented in the vendor’s official security bulletin (KB0133782). Organizations should confirm their deployed version and upgrade to the version specified in the HCL advisory.
- If immediate patching is not possible:
- Restrict network access to the HCL BigFix Service Management search functionality to trusted networks only, minimizing exposure to unauthenticated internet-based attackers.
- Deploy egress filtering/network segmentation so that the BigFix Service Management application server cannot reach sensitive internal hosts, services, or cloud metadata endpoints, limiting the blast radius of any successful SSRF exploitation.
- Monitor outbound requests originating from the BigFix Service Management server for unusual destinations (e.g., internal IP ranges, link-local/metadata addresses, or unexpected external hosts).

