Login on second attempt after one unsuccessful try redirects customer to 404 page

[mfickers]

Preconditions (*)

1. Reproduced on Magento 2.4.1, Magento 2.4.2
2. Config "customer/startup/redirect_dashboard" is set to "No"

Steps to reproduce (*)

1. Navigate to login page, without referrer parameter in URL (i.e. "/customer/account/login/")
2. Enter invalid login data and try to login
3. After page reload, URL will now contain a referrer parameter, which is the URL to "/customer/account/loginPost/" as base64 encoded string
4. Enter correct login data and login
5. You will be redirected to "/customer/account/loginPost", which will display a 404 error page, because this controller is not available for GET requests

Expected result (*)

1. Unsuccessful login redirects back to login page without adding a referrer

Actual result (*)

1. Unsuccessful login adds invalid URL as referrer parameter

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @mfickers. Thank you for your report.
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[m2-assistant]

Hi @engcom-Oscar. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

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  Details

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• 3. Add Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 4. Verify that the issue is reproducible on 2.4-develop branch

  Details

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[magento-engcom-team]

✅ Confirmed by @engcom-Oscar
Thank you for verifying the issue. Based on the provided information internal tickets MC-42075 were created

Issue Available: @engcom-Oscar, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[mrtuvn]

This issue should have P2 priority in my opinion
@mfickers Can you create PR for this problem

[m2-assistant]

Hi @mrtuvn. Thank you for working on this issue.
Looks like this issue is already verified and confirmed. But if you want to validate it one more time, please, go though the following instruction:

• 1. Add/Edit Component: XXXXX label(s) to the ticket, indicating the components it may be related to.
• 2. Verify that the issue is reproducible on 2.4-develop branch
     Details

     - Add the comment @magento give me 2.4-develop instance to deploy test instance on Magento infrastructure.
     - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
     - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!
• 3. If the issue is not relevant or is not reproducible any more, feel free to close it.

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