Server compromise via unrestricted malicious file upload
Published Sep 18, 2026 · Updated Sep 18, 2026
Unrestricted file upload in HCL BigFix Service Management 27 allows remote attackers to execute payloads and compromise the server. The file-upload path applies improper validation to attacker-supplied files, accepts a dangerous payload, and permits its execution, although HCL has not identified the affected endpoint. HCL describes the uploader as unauthenticated, while its CVSS assessment requires low privileges and user interaction; the published record does not reconcile this access gate.
Summary
What happened
Unrestricted file upload in HCL BigFix Service Management 27 allows remote attackers to execute payloads and compromise the server. The file-upload path applies improper validation to attacker-supplied files, accepts a dangerous payload, and permits its execution, although HCL has not identified the affected endpoint. HCL describes the uploader as unauthenticated, while its CVSS assessment requires low privileges and user interaction; the published record does not reconcile this access gate.
The record
- CVE
- CVE-2026-56590
- Published
- Sep 18, 2026
- Updated
- Sep 18, 2026
- Vendor
- HCL Software
- Product
- HCL BigFix Service Management
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 18, 2026CVE publishedPublication date reported by the CVE source.
- Sep 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=v27
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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