CVE-2026-12554: HP Easy Start Privilege Escalation Flaw

CVE-2026-12554 Overview

CVE-2026-12554 is a local privilege escalation vulnerability affecting HP Easy Start for macOS versions prior to 2.16.7.260722. The flaw stems from the use of an outdated or risky component, tracked under CWE-1104. A local attacker with low privileges can leverage the weakness to elevate privileges on the affected macOS host. HP has issued updated software to remediate the issue.

Critical Impact
A local, authenticated attacker can escalate privileges on macOS systems running vulnerable versions of HP Easy Start, gaining high impact to confidentiality, integrity, and availability.

Affected Products

HP Easy Start for macOS versions prior to 2.16.7.260722
macOS endpoints with HP printer installation utilities deployed
Enterprise fleets managing HP print devices through the Easy Start setup tool

Discovery Timeline

2026-08-24 - CVE-2026-12554 published to the National Vulnerability Database (NVD)
2026-08-27 - Last updated in NVD database

Technical Details for CVE-2026-12554

Vulnerability Analysis

HP Easy Start is a macOS setup utility that installs drivers and configures HP printers. The vulnerability allows a local user to escalate privileges when the utility executes with elevated rights during installation or update flows. Because the attack vector is local and requires only low privileges without user interaction, any authenticated user on the affected host can exploit the weakness.

Successful exploitation yields high impact across confidentiality, integrity, and availability of the compromised endpoint. An attacker gaining root on macOS can install persistent implants, disable security controls, and access data belonging to other users.

Root Cause

The issue is categorized under CWE-1104: Use of Unmaintained Third Party Components. Outdated or risky components bundled with the installer expose privilege escalation primitives that a local attacker can invoke. HP has not publicly detailed the vulnerable subcomponent beyond noting that the potential vulnerabilities lead to escalation of privilege.

Attack Vector

Exploitation requires local access with a valid account on the macOS system. No user interaction is needed to trigger the privileged code path. An attacker typically stages malicious files, symbolic links, or IPC messages that the privileged HP Easy Start process consumes during its normal operation.

No public proof-of-concept has been published and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability reflects a low near-term likelihood of mass exploitation, though targeted post-compromise use remains a realistic scenario.

Refer to the HP Security Bulletin for vendor-provided technical guidance.

Detection Methods for CVE-2026-12554

Indicators of Compromise

Execution of HP Easy Start binaries from non-standard paths under /Applications or /tmp
Unexpected child processes spawned by HP Easy Start helper tools running as root
Modification of files or symbolic links in HP Easy Start working directories immediately before installer invocation
New LaunchDaemons or privileged helper tools created following an HP Easy Start session

Detection Strategies

Inventory macOS endpoints and identify installations of HP Easy Start with a version earlier than 2.16.7.260722
Monitor process telemetry for privileged HP helper tools executing user-writable content
Alert on unexpected sudo, AuthorizationExecuteWithPrivileges, or SMJobBless activity originating from HP Easy Start

Monitoring Recommendations

Enable macOS endpoint detection with process, file, and code-signing telemetry
Correlate installer activity with subsequent creation of LaunchDaemons or setuid binaries
Review software inventory reports on a recurring basis to flag versions of HP Easy Start prior to 2.16.7.260722

How to Mitigate CVE-2026-12554

Immediate Actions Required

Update HP Easy Start for macOS to version 2.16.7.260722 or later on all managed endpoints
Restrict local user permissions on shared macOS systems where HP Easy Start is installed
Remove HP Easy Start from endpoints that no longer require printer setup functionality

Patch Information

HP has released HP Easy Start 2.16.7.260722 to remediate CVE-2026-12554. Administrators should deploy the fixed version through their standard macOS software distribution channels. Consult the HP Security Bulletin for the authoritative advisory and download links.

Workarounds

Uninstall HP Easy Start on macOS hosts that do not require it, particularly on multi-user or kiosk systems
Limit interactive login on affected macOS endpoints to trusted administrators until the patch is deployed
Enforce endpoint application allowlisting to prevent execution of untrusted binaries alongside HP Easy Start

bash

# Verify installed HP Easy Start version on macOS
mdls -name kMDItemVersion "/Applications/HP Easy Start.app"

# Remove the vulnerable application if the printer setup is no longer needed
sudo rm -rf "/Applications/HP Easy Start.app"