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42 votes
Accepted

How does one Stack Exchange site know that I'm logged in to the other?

Once you get authenticated on a single site, the full.js gets loaded, which has a function UniversalAuth.performAuth() which gets called. That function starts with an XMLHttpRequest POST to /users/...
rene's user avatar
  • 90.8k
37 votes
Accepted

Should we prank not-logged-in users?

I was about to raise the same issue. Our April Fool's jokes are aimed at insiders. The vast majority of our users come from Google and aren't logged in. These are people who are looking for an ...
Monica Cellio's user avatar
30 votes

WordPress.com button is going away from login/signup screens

Based on the reasons given, it sounds like a reasonable step to remove WordPress as a standard selection option (although with a less than optimal short notice!). However, having to type in something ...
hlovdal's user avatar
  • 992
24 votes

Should we prank not-logged-in users?

having viewed thousands of stack* pages over recent years, this gag was the cake. finally went through the wibble of checking how this login system worked these days and signed up. just to say, ...
ocæon's user avatar
  • 963
23 votes

I changed my Stack Overflow account email address. Suddenly, my username and photo changed too

You had two accounts registered, one with both of the different email addresses you used. When you confirmed the second email address to one of your accounts, it triggered an automatic merge since you ...
animuson's user avatar
  • 189k
22 votes
Accepted

Stack Overflow login problem - I can't log in!

The solution is to allow cookies for Stack Overflow. Sometimes browsers tend to automatically block cookies but if you allow them you're good to go. Steps to allow third party cookies in Chrome ...
LoneWolf's user avatar
  • 715
20 votes
Accepted

Can a hacker who hacked a Facebook account access security.stackexchange.com through their linked OAuth account?

Can a hacker who hacked Facebook log into a linked Security.StackExchange account and suspend other accounts, edit the questions to point to malicious URLs, or delete content? That's kind of the ...
animuson's user avatar
  • 189k
19 votes

Why is my account suddenly merged with a totally different user's account?

Contact us through the "Contact" link at the bottom of the page and provide details. An employee will review what happened and respond as soon as possible.
Adam Lear's user avatar
  • 159k
19 votes
Accepted

Will Google+ APIs shutting down affect signing in into Stack Exchange sites?

The Google+ API shutdown will not affect our login system at all. We have already been using the generic Google OAuth2 API for some time, which is a completely independent API and is not being ...
animuson's user avatar
  • 189k
17 votes

How does SO's new auto-login feature work without any refresh?

Back in 2015, we announced a redesign of the login system. It's been running for a few months now and seems to be doing alright. When you log in, we issue a cookie for the second-level domain of the ...
Adam Lear's user avatar
  • 159k
16 votes
Accepted

Cannot delete a login

Apologies for the inconvenience here folks. We've been going through some big frontend overhauls within our codebase, and one of them unexpectedly affected the "Remove Login" functionality. ...
Felippe Rangel's user avatar
  • 5,114
15 votes

Authenticate to Stack Exchange using GitHub

The PR was finally approved and merged: https://stackoverflow.blog/2019/11/11/announcing-support-for-github-authentication-in-stack-overflow/
Geoff Dalgas's user avatar
  • 48.8k
15 votes
Accepted

How does the current SSO of SE work?

Whoops, missed this question when it was first posted... I assume/hope you no longer need this answer a whole year later, but I figured I'd write up the details for posterity. We do our own session ...
Adam Lear's user avatar
  • 159k
15 votes

Should we prank not-logged-in users?

Pardon my ignorance, but I have no idea what this joke is meant to be. If anything, I agree that it should be restricted to an opt-in for registered users. It's annoying for people coming from Google, ...
Coder17's user avatar
  • 313
15 votes

Stack Overflow sites force the wrong Google account when signing in with Google

Go to https://accounts.google.com, and if necessary switch to the account that it keeps trying to log you in to stack overflow sites as. On the left hand side, choose "Security". Scroll down ...
dovalojd's user avatar
  • 251
15 votes

Did something change with Stack Exchange's cross-domain login process? (no longer working)

Yes, something did change. The browsers we all use got a bit more picky about which cookies they accept. In my answer on How does one Stack Exchange site know that I'm logged in to the other? I ...
rene's user avatar
  • 90.8k
14 votes

Should we prank not-logged-in users?

Yes, we should prank everyone. This network of sites tries to be inclusive, so it should treat everyone the same, logged in or not logged in. The argument that casual visitors that arrive from ...
rene's user avatar
  • 90.8k
14 votes

Let us sign in with GitHub on all Stack Exchange sites, not only Stack Overflow

Today I was wondering why I can't log in with GitHub on superuser.com when I did this on stackoverflow.com. I would expect to be able to use my account on all sites of Stack Exchange. I tried to use ...
Hans Wurst's user avatar
13 votes
Accepted

Pressing "tab" in log-in form switches to "Forgot password?"

A fix for this has merged into master and will be built soon, likely sometime tomorrow. I first looked into solving this by implementing tabindex on each of the inputs, but the latest thinking behind ...
Aaron Shekey's user avatar
  • 14.8k
13 votes
Accepted

What is the minimum reputation amount required to view questions without replies tagged as "duplicate""?

The minimum reputation is 1. You just need to have an account and be logged in for the redirect not to be applied; it only applies to anonymous (logged-out) users: Starting with the next build, ...
Glorfindel's user avatar
  • 252k
13 votes

Can Stack Exchange prevent users from signing up with a username that is already in use?

A user's username isn't unique by design. If there's an actual risk of impersonation (say if someone else called themselves Journeyman Geek, and had a dog as an avatar) flag it, explain what's going ...
Journeyman Geek's user avatar
12 votes

Can't change password

Yes, it's not working.. The solution for it is not to change your password with Stack Overflow's My Logins, instead logout your account and use the "forget password" option and follow the given ...
5ervant - techintel.github.io's user avatar
12 votes
Accepted

Unable to login to 2020 Winter Bash page

The Winter Bash application has been updated to point to this year's domain in preparation and it is no longer possible to login to the previous site. The old Winter Bash site will be removed ...
animuson's user avatar
  • 189k
12 votes

The same password is not working across all Stack Exchange sites

You have two emails attached to your account. One has a password and the other does not. Attempting to reset your password for the email which is not set up with a password actually redirects the ...
animuson's user avatar
  • 189k
12 votes
Accepted

Sporadic login/logout issues after February 24 maintenance

By all things we can measure, we believe this issue has been resolved. What happened? (Working theory.) The command that moves our sites out of maintenance mode did not complete successfully on one of ...
Aaron Bertrand's user avatar
  • 42.7k
11 votes
Accepted

I've lost access to my SE email and password; do I have options?

If you no longer have access to the email address, then there is no way to reset the password for it if you have forgotten it. You can, however, add a new credential to your account so that you can ...
animuson's user avatar
  • 189k
11 votes
Accepted

Is Area 51 login broken?

Apologies again for the delay. I believe I have the real fix out in production now. Please let me know if you're still running into issues signing up on Area 51.
Adam Lear's user avatar
  • 159k
11 votes
Accepted

Why not add optional simple TOTP 2FA?

I would not call 2FA simple at all. Anything that touches the core authentication part has the potential for disastrous security issues, so even if it were simple it still would require a lot of work ...
Mad Scientist's user avatar
11 votes

Stack Overflow login problem - I can't log in!

For me, it was Adblock Plus that was preventing the login. I disabled it temporarily, logged in, and everything works. Chrome Version 87.0.4280.88 (Official Build) (x86_64) macOS 11.0.1
Blink's user avatar
  • 211
11 votes
Accepted

I'm no longer able to log in to stackoverflow.com from Login link on that site

This was an issue with our CDN that was localized to the Chicago region, it should be resolved now. https://www.stackstatus.net/incidents/7ee6a6f9-73b2-49f0-b9ef-b2864dda8317
Josh Zhang's user avatar
  • 9,927

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