v4.13.0

punkpeye/fastmcpv4.13.0Aug 7, 2026by github-actions[bot]

AI Summary

Introduces a new configuration option to enforce S256 code challenges in OAuth flows.

Key Highlights

Adds `allowPlainPkce` configuration
Enforces S256 code challenges

New Features

allowPlainPkce configuration option

Full Release Notes

# [4.13.0](https://github.com/punkpeye/fastmcp/compare/v4.12.8...v4.13.0) (2026-08-07)


### Features

* **auth:** add allowPlainPkce to require S256 code challenges ([fe382cb](https://github.com/punkpeye/fastmcp/commit/fe382cbed6a40398e7e91a7aedc63341f29addd0))