---
title: "Upload a third-party certificate"
slug: "upload-a-third-party-certificate"
tags: ["Product Usage", "ENS 10.7.x", "Endpoint Security"]
updated: 2026-09-14T20:39:21Z
published: 2026-09-14T20:39:21Z
canonical: "docs.trellix.com/upload-a-third-party-certificate"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trellix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Upload a third-party certificate

If you trust an uploaded certificate, the DLL of the certificate is allowed to be injected into a Trellix process.

Otherwise, the DLL of the certificate is not allowed to be injected into a Trellix process.

The certificate must be in one of these formats:

- .cer files (Base-64 encoded X.509 certificate)
- Plain text certificate content in Base-64 encoded X.509

**Task**

1. Select **Menu** → **Policy** → **Policy Catalog** and then select **Endpoint Security Common** from the **Products** list in the left pane.
2. From the **Category** list in the right pane, select **Options**.
3. Click the name of an editable policy.
4. Click **Show Advanced**.
5. In the **Certificates** section, click **Upload Client Certificate**.
6. Select a certificate file (.cer) or provide certificate text in Base-64 encoded X.509 format.
7. Click **Save**.