On 18th April 2021, a security researcher identified a vulnerability in our review-cask-pr GitHub Action used on the homebrew-cask and all homebrew-cask-* taps (non-default repositories) in the Homebrew organization and reported it on our HackerOne. Whenever an affected cask tap received a pull request to change only the version of a cask, the review-cask-pr GitHub Action would automatically revie