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

# Vantage 3.0.4 release notes

> ABBYY Vantage 3.0.4: critical security updates, Vantage 3.0 Migrator enhancements, and fixes for Advanced Designer, Custom activity HTTP headers, and Input activity links.

## Improvements

### Security

* Critical security updates have been applied to address identified vulnerabilities.

### Migrator

We’ve delivered a series of enhancements to the Vantage 3.0 Migrator to improve reliability, transparency, and overall migration experience as customers transition from Vantage 2.7.x to 3.0.

These updates are based on real-world migration learnings and are designed to increase predictability, reduce manual intervention, and accelerate time to value.

## Fixes

* Fixed an issue in Advanced Designer where "Loading Form" displayed for pre-migration documents with no completion (654385, 656672)

* Custom Activities that use `HttpRequest` and `MultipartFormDataRequest` can now override the HTTP `Accept` header via `SetHeader("accept", "...")`. Previously, Vantage always sent `Accept: application/json` even when a custom value was provided, which caused integrations to fail when a non-JSON response (e.g., XML) was expected.

* Fixed the Inline documentation link in the Input Activity that pointed to a deprecated help URL. (661030)

## Known Issues

* In Vantage 3.0.4, an Azure OpenAI option appears under Configuration > Connections that is not yet supported in this release. Attempting to configure this connection will result in a validation error. No data will be saved or affected.