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Check this issue when OpenID Connect and the normal registration page exist (Account Takeover)

 I found one logical issue when I was testing. I am directly coming to the test case because there is nothing much here to explain.

  1. The attacker created his account by using attacker@gmail.com and logged into the application.
  2. The attacker clicked on the change email functionality and mentioned the victim email ID victim@gmail.com.
  3. Now, Victim thought to create an account by using OpenID Connect (Gmail SSO). The victim logged into the application.
  4. As the attacker already changed his email ID to the victim, so now the attacker used victim's email ID and attacker password to log into the attacker account.
  5. What the victim does in his account, it’s visible to the attacker.
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