CVE-2023-47200 is a high severity local privilege escalation in the Trend Micro Apex One plug-in manager, scored 7.8. An origin validation error lets someone who already runs code on the machine reach SYSTEM. Apply Apex One SP1 Critical Patch 12526, or the September 2023 monthly patch for the as a service edition.
What's affected
Trend Micro's security bulletin for Apex One, dated 6 November 2023, lists Apex One 2019 (on premises) and Apex One as a Service, both on Windows. The minimum fixed levels are Apex One Service Pack 1 Critical Patch 12526 for on premises installs, and the September 2023 monthly patch (202309) with agent version 14.0.12737 for the as a service edition. Trend Micro advises moving to the latest version if a newer one exists.
This entry is the plug-in manager origin validation issue CVE-2023-47200. Per the Zero Day Initiative, the flaw is in the Apex One Client Plug-in Service Manager. The issue results from insufficient validation of the origin of commands, which lets a local attacker escalate privileges and run code as SYSTEM. NVD notes it is similar to, but not identical to, CVE-2023-47201.
Dates differ across sources, and it is worth knowing why. The Zero Day Initiative advisory ZDI-23-1618 was released on 14 November 2023, the bulletin is dated 6 November 2023, and the NVD record shows 23 January 2024. These are different events for the same issue, so do not read the NVD date as the date a fix appeared. Severity matches across sources, 7.8 High, with a local vector.
The NVD record was published on 2024-01-23, scores 7.8 (High), and carries the vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Weakness class: CWE-346.
How to check if you're exposed
Apex One agents and the management server are managed from the console, so the check is a version comparison, not a command.
- Open the Apex One management console and review the version of the management server and the agents.
- For on premises installs, confirm that Service Pack 1 Critical Patch 12526 or later is applied, using the readme linked from Trend Micro's bulletin.
- For Apex One as a Service, confirm the agent version is 14.0.12737 or later and the September 2023 monthly patch is in place.
- Sort agents by version and find the machines that are behind, especially shared workstations and servers.
Plug-in components run on every endpoint with the agent, so the inventory is the whole fleet, not just a few servers.
What to do now
- Read Trend Micro's bulletin and note the minimum patch for your edition.
- Apply the patch to the management server first, then deploy updated agents.
- Find agents that did not update, such as machines that are offline or excluded from policy, and bring them current.
- Test the new self protection behavior. Trend Micro warns that apps not signed by Trend Micro or Microsoft that inject into other processes may be blocked, so add exceptions for trusted tools through the documented process.
- Review who can run code as a standard user on important machines, since every attack in this family starts there.
Why it matters
Plug-in managers load and control extra components of a product. Because they run with high rights, they must be careful about who is allowed to give them instructions. Here the weakness is classed as CWE-346.
Trend Micro and NVD describe the issue the same way as the NT Listener issues, but in a different service. The plug-in service manager is one of several local services the agent exposes, and each needs the same care.
This CVE and CVE-2023-47201 are a pair. The record for the other one uses a different weakness tag, so scanners may group them differently. The record's KEV flag is false, so this CVE is not on the CISA Known Exploited Vulnerabilities list.
Quick check
How is this different from the NT Listener issues?
The Zero Day Initiative places it in the Client Plug-in Service Manager, a different service. The attack needs the same starting point and the same patch fixes it.
Sources
Last reviewed: 19 October 2026.
