CVE-2026-24067: Slate Digital Connect macOS Privilege Escalation via XPC PID-Based TOCTOU Race Condition

Technical summary

CVE-2026-24067 is a time-of-check time-of-use (TOCTOU) race condition in the XPC service com.slatedigital.connect.privileged.helper.tool exposed by Slate Digital Connect 1.37.0's privileged helper daemon on macOS. The vulnerability arises from PID-based code-signing validation: the helper retrieves a connecting client's process identifier, queries the system for code-signing information associated with that PID, and grants access based on the result. Because POSIX process identifiers are finite and reused, an attacker can spawn a process, cause it to connect to the XPC service, then exit before validation completes while a second malicious process assumes the same PID. The helper validates against the trusted process's credentials but the actual XPC message handler receives the attacker's process, bridging the gap between authentication and authorization. The vulnerability maps to CWE-367 (Time-of-check Time-of-use Flaws).

Business impact

Compromise of a single user's Mac running Slate Digital Connect 1.37.0 can result in full system compromise. An attacker with local access (e.g., a contractor with a user account, malicious software already running in the user's session, or a physical threat actor) can escalate to root-level privileges without user interaction or additional credentials. This undermines endpoint security posture, enables persistence, lateral movement within networked environments, data exfiltration, and deployment of malware. For organizations relying on Slate Digital's professional audio software in security-sensitive workflows, this vulnerability represents a critical attack surface.

Affected systems

The vulnerability affects Slate Digital Connect version 1.37.0 running on macOS. The vulnerability is present in the privileged helper tool installation; both Intel and Apple Silicon Macs are affected. Users of earlier versions should verify their version against vendor advisories, and those on later versions should confirm patches are applied. The vulnerability does not affect Windows or Linux, nor other Slate Digital products not using this privileged helper architecture.

Exploitability

Exploitability is high because the attack requires only local access to the system, no special user interaction, and no additional privileges to initiate. The TOCTOU window is typically small but reliable to trigger through rapid process spawning and connection attempts. The attack does not require code injection, memory corruption exploitation, or kernel vulnerabilities. Any malware, sandboxed application escape, or local attacker can attempt exploitation. The lack of a public exploit and its absence from the CISA KEV catalog does not diminish practical exploitability; this is a textbook privilege escalation primitive that will attract security researcher attention.

Remediation

Users should update Slate Digital Connect to a patched version released after 2026-06-17, pending verification against the vendor's official security advisory. Administrators should prioritize this update for systems where Slate Digital Connect is installed, particularly in environments where users have administrative access or run untrusted code. As an interim compensating control, restrict physical and remote access to machines running the affected version and monitor for suspicious process creation patterns or XPC service calls. Disable the privileged helper if Slate Digital Connect functionality can be degraded without it.

Patch guidance

Verify the exact patched version number from Slate Digital's official security advisory or release notes. Updates should be distributed through the application's built-in update mechanism or the vendor's download portal. Test patches in a non-production environment first, particularly in professional audio workflows where compatibility is critical. Ensure all instances of Slate Digital Connect are updated; check multiple user accounts and shared machines. Post-update, verify the privileged helper tool's version by inspecting the bundle at /Library/LaunchDaemons/ and /Library/PrivilegedHelperTools/ to confirm the helper binary has been replaced.

Detection guidance

Monitor for rapid process creation and termination patterns, particularly processes that instantaneously die after spawning. XPC call auditing via log(1) and log stream(1) can capture connections to com.slatedigital.connect.privileged.helper.tool; look for failed authentication attempts or unusual calling sequences. Endpoint Detection and Response (EDR) solutions should flag privilege escalation events (e.g., unprivileged process spawning children with elevated privileges or accessing kernel audit trails). File integrity monitoring on /Library/PrivilegedHelperTools/ can detect tampering. Behavioral indicators include processes connecting to privileged XPC services followed by unexpected high-privilege child process execution.

Why prioritize this

This vulnerability merits immediate prioritization due to its HIGH CVSS score (8.4), local attack vector requiring no user interaction, direct path to privilege escalation, and absence of authentication or authorization checks that an attacker must bypass. The TOCTOU race condition is a well-understood exploit pattern in macOS security research. Slate Digital Connect is used in professional audio production environments where systems often run with minimal oversight, making them attractive targets. The modified date of 2026-06-17 suggests active tracking; plan patching within 30 days of release confirmation.

Risk score, explained

The CVSS v3.1 score of 8.4 (HIGH) reflects Attack Vector: Local (requires attacker already on the system), Attack Complexity: Low (race condition is easy to trigger), Privileges Required: None (attacker starts unprivileged), User Interaction: None (no user action needed), Scope: Unchanged (impact confined to the system), and full Confidentiality, Integrity, and Availability impact (attacker gains root). The score does not account for reduced exploitability if the application is installed on air-gapped systems or rarely used; conversely, it may be understated if Slate Digital Connect is deployed in containerized or virtualized environments where PID reuse patterns differ.

Frequently asked questions