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CVE-2026-18265 – Unauthenticated Remote Code Execution – OSNEXUS QuantaStor 6.7.3.010+9c965a6414

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Summary

CVE-2026-18265 is a critical vulnerability in OSNEXUS QuantaStor, a software-defined storage management platform, that allows remote, unauthenticated attackers to execute arbitrary code with root privileges. The flaw resides in the configuration of Kapacitor, a component bundled with QuantaStor, and stems from a missing authentication check on functionality that should require credentials. The issue carries a CVSS v3.0 score of 9.8 (Critical) and requires no authentication or user interaction to exploit.

Technical details

  • Root cause: QuantaStor’s Kapacitor configuration lacks proper authentication controls on functionality that can be leveraged to achieve code execution (CWE-306: Missing Authentication for Critical Function).
  • Trigger conditions: An attacker needs only network access to the exposed QuantaStor/Kapacitor service; no valid credentials or user interaction are required.
  • Attack vector: Network (remote), low attack complexity, no privileges required, no user interaction.
  • Impact: Successful exploitation allows arbitrary code execution in the context of root, resulting in complete compromise of confidentiality, integrity, and availability of the affected storage system.

Affected software

  • OSNEXUS QuantaStor version 6.7.3.010+9c965a6414 (and earlier versions sharing the vulnerable Kapacitor configuration, per the vendor’s fixed-version guidance)

Severity

  • CVSS v3.0 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade OSNEXUS QuantaStor to version 6.8.0 or later, which remediates this vulnerability.
  • If immediate patching is not possible:
    • Restrict network access to QuantaStor management interfaces and the Kapacitor service to trusted, internal networks only; do not expose these services directly to the internet.
    • Use firewall rules or network segmentation/VPN access to limit which hosts can reach the affected service.
    • Monitor QuantaStor systems for unexpected process execution or unauthorized configuration changes as an interim detective control until the patch can be applied.

References

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