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How to fix CORS errors with Memberstack custom domain script blocking XMLHttpRequest?

Nothing on my Memberstack site is working all of the sudden? When I check the console in chrome it reads:

Access to XMLHttpRequest at 'https://client.memberstack.com/app-member?includeSSOText=undefined&trackPageView=true' from origin 'https://www.reviewfunnel.io' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Everyone else up and running?

14 comments

  • Veggie Vision
    Veggie Vision

    Mine isn't letting me submit forms, log out, create an account etc. 

    1
  • Noah Reeves
    Noah Reeves OP

    This is so unfortunate because I just got on the paid plan and now nothings working 😭

    1
  • Stylianos Papapetrou
    Stylianos Papapetrou

    Same problem for me as well

    1
  • Veggie Vision
    Veggie Vision

    That is sods law right there! I am just testing everything on mine before i upgrade and now it's not working, terrible timing for us both! Hopefully its back up soon

    1
  • Stylianos Papapetrou
    Stylianos Papapetrou

    The thing is we are running campaigns right now and new leads are complaining that they can not sign up...

    1
  • Noah Reeves
    Noah Reeves OP

    Wow. Sucks everyone is dealing with this, their status page doesn't seem to be picking this up as it says everything is fine: https://status.memberstack.com/

    0
  • Stylianos Papapetrou
    Stylianos Papapetrou

    Now I think its okay

    1
  • Duncan from Memberstack
    Duncan from Memberstack

    I can confirm that Memberstack was down intermittently for an hour before we found the problem and pushed a fix. We've also fixed the underlying issue so it won't happen for the same reason again. 

    1
  • Noah Reeves
    Noah Reeves OP

    Thanks for the speedy fix!

    0
  • Duncan from Memberstack
    Duncan from Memberstack

    Massak Chrait Please reach out to support ASAP and/or share a link to your website here. It sounds like there is something else going on with your site. 

    0
  • Asaad Mahmood
    Asaad Mahmood

    Hey guys, getting these CORS issues when you use the custom domain script.
    Any idea why?

    The root domain seems to be the same.

    0
  • Chukwudi
    Chukwudi

    Hi Asaad,

    At what point does that error appear? I just checked your website but couldn’t find it in the console.

    Also, please move the cross-domain script below so it’s placed before the Memberstack install code - I noticed you currently have it after instead.

    0
  • Asaad Mahmood
    Asaad Mahmood

    Chukwudi You can see the erros here:
    https://www.upgradeformula.com/log-in

    They just appear automatically, even if I do nothing.

    https://memberstack.slack.com/files/U02VA9M30H4/F09AGMY99EH/whatsapp_video_2025-08-15_at_02.55.03.mp4

    I had to remove them to try out the old script because even my login stops working with the updated script.

    I also want to know, I have a Webflow Memberstack site, and another site https://upgradeiq.upgradeformula.com/ hosted on the learnworlds platform.

    I want to be able to login to the webflow site and not log in to learnworlds.
    I made the root domain the same and can also add the memberstack script to it.

    Would that help me prevent a double login?

    The login button here is linked to memberstack, if I login to my page on webflow, it still asks me to login again on this SSO button that’s linked to memberstack.

    0
  • Asaad Mahmood
    Asaad Mahmood

    The CORS issue is resolved.

    0

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