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CVE-2026-7861 – Unauthenticated Remote Code Execution via Insecure Deserialization – Next4Biz CSM (a

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Summary

CVE-2026-7861 is a critical deserialization-of-untrusted-data vulnerability in Next4Biz Information Technologies Inc.’s CSM (Customer Service Management) platform that allows an unauthenticated attacker to achieve code injection. The flaw carries a CVSS v3.1 base score of 9.8 (Critical) and is remotely exploitable over the network without authentication or user interaction. The vendor was notified during coordinated disclosure but did not respond, and no patched version has been published.

Technical details

  • Root cause: The application deserializes untrusted, attacker-controlled data without adequate validation (CWE-502), enabling injection of malicious objects/code during the deserialization process.
  • Trigger conditions: An attacker submits crafted serialized data to a reachable endpoint in the CSM application; no valid credentials or user interaction are required.
  • Attack vector: Network — the vulnerable functionality is exposed over the network (AV:N), with low attack complexity (AC:L).
  • Impact: Successful exploitation results in code injection (CAPEC-242), with full compromise of confidentiality, integrity, and availability of the affected system.

Affected software

  • Next4Biz CSM (Customer Service Management) — all versions through 07092026 (i.e., all releases up to the disclosure date).

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No official patch has been released by Next4Biz as of publication; the vendor did not respond to disclosure attempts. Contact Next4Biz support directly to confirm whether an update addressing this issue is available before deploying any fix.
  • If no patch: Restrict network access to Next4Biz CSM instances to trusted networks only (e.g., VPN, IP allow-listing) to reduce exposure to unauthenticated network-based attacks; monitor for anomalous or malformed serialized payloads sent to the application; consider placing a WAF in front of the application to filter suspicious deserialization payloads; and prioritize inventorying all internet-facing Next4Biz CSM deployments for risk assessment.

How IONIX identifies potentially affected assets

IONIX matches the following signal against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Response header x-powered-by: Next4biz CRM Handler

References

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