ruby-on-railsrubycsrfcsrf-token

Rails 6 CSRF Token Expiry issue

We are encountering an issue with form submission in production environment. The criteria seems to be exceptionally rare, I have been unable to replicate the issue.

CSRF token is created and validated just fine.

Timing

Issue seems to occur only when users wait more than 2 hours on a form before submitting, but doing this we have been unable to reproduce as well. Logs

W, [2022-07-14T15:19:37.535241 #2433]  WARN -- : Can't verify CSRF token authenticity.
I, [2022-07-14T15:19:37.535556 #2433]  INFO -- : Completed 422 Unprocessable Entity in 1ms (ActiveRecord: 0.0ms | Allocations: 291)
F, [2022-07-14T15:19:37.536425 #2433] FATAL -- :   
ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken):

System configuration

Rails version 6.1.6 Ruby version 2.7.4

Solution

  • The issue was caused by rails-ujs failing to insert CSRF token alongside remote form submissions in some cases.

    I was not able to identify the root cause but an upgrade to Rails 7 and Turbo fixed the issue.