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CVE-2026-89084 – Remote Code Execution / Arbitrary File Write / Privilege Escalation – HP Advance (H

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Summary

CVE-2026-89084 is a path traversal vulnerability (CWE-22, "Improper Limitation of a Pathname to a Restricted Directory") affecting the HP Advance server software, specifically the HP AC Print & Scan and HP Output Central components. HP states the flaw could allow elevation of privilege, remote code execution, or arbitrary file write on the hosting server. The vulnerability carries a CVSS score of 8.8 (High) and is remotely exploitable over the network without authentication or user interaction.

Technical details

  • Root cause: Improper limitation of a pathname to a restricted directory (path/directory traversal, CWE-22) within HP Advance server components.
  • Trigger conditions: An attacker sends crafted requests to a reachable HP Advance server instance that fail to properly sanitize file path input, allowing access outside the intended restricted directory.
  • Attack vector: Network-based; no privileges and no user interaction are required to exploit the flaw (AV:N/AC:L/PR:N/UI:N per the published vector).
  • Impact: Successful exploitation can result in arbitrary file write on the server, which HP indicates may lead to elevation of privilege or full remote code execution on the affected host, with high impact to integrity and availability.

Affected software

  • HP AC Print & Scan: versions prior to V1R4.0.027
  • HP Output Central: versions prior to V1R4.0.029

Severity

  • CVSS Score: 8.8 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
  • Attack Vector: Network | Attack Complexity: Low | Privileges Required: None | User Interaction: None | Integrity Impact: High | Availability Impact: High

Mitigation and recommended actions

  • Immediate: Upgrade HP AC Print & Scan to version V1R4.0.027 or later, and upgrade HP Output Central to version V1R4.0.029 or later, per HP’s official security bulletin (HPSBPI04149).
  • If patching cannot be performed immediately: Restrict network exposure of HP Advance server components (HP AC Print & Scan and HP Output Central) to trusted internal networks only, and avoid exposing these services directly to the internet until patched.
  • Monitor affected servers for anomalous file write activity or unexpected process execution as an interim compensating control while patching is scheduled.

References

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