Introduction
“Sign in with Google” or “Continue with Facebook” has become one of the most common ways to create accounts online. It’s fast, convenient, and removes the need to remember multiple passwords.
But behind that convenience is a system that many users don’t fully understand. While social login is generally secure when used correctly, it also introduces risks—especially if permissions are not reviewed or accounts are not properly protected.
Understanding how it works can help you use it more safely.
What Happens When You Click “Sign in With Google”
When you use a social login option, you’re not just logging in—you’re allowing a third-party app to connect with your main account.
This process is based on a system called OAuth, which allows apps to request access to certain parts of your profile without sharing your password directly.
Depending on what you approve, the app may gain access to:
- Your name and email address
- Profile information (profile picture, age range)
- Account ID and login activity
- In some cases, additional data like contacts or calendar access
- Email address for account verification
- Basic demographic information
Most of the time, this access is limited—but it depends on the permissions you grant.
How OAuth Works
- You click “Sign in with Google/Facebook”
- You’re redirected to the platform’s login page
- You’re shown a permission screen
- You approve (or deny) the requested access
- The app receives a token to access approved information
- You’re logged in without sharing your password
How Apps Gain Access to Your Data
When you click a social login button, you’ll often see a permission screen. This is where the app requests access to specific data.
However, many users quickly accept these requests without reviewing them carefully.
Over time, this can lead to:
- Multiple apps connected to your account
- Permissions granted that are no longer needed
- Access remaining active even if you stop using the app
- Apps retaining access to data they don’t actually need
This creates a growing list of connected services that may still have access to your information.
Common Permission Types
| Permission | What It Allows | Risk Level |
|---|---|---|
| Email address | App knows your email | Low |
| Name and profile info | App can display your identity | Low |
| Friends list | App can see your connections | Medium |
| Email content | App can read your emails | High |
| Calendar | App can view/edit your calendar | High |
| Contacts | App can access your address book | High |
| Post on your behalf | App can publish as you | High |
The Risk of a Single Account Being Compromised
One of the biggest risks of social login is centralization.
If your Google or Facebook account is compromised, any service linked through it could also be at risk.
This can lead to:
- Unauthorized access to multiple accounts at once
- Loss of control over connected services
- Difficulty recovering accounts if the main login is affected
- Cascading account takeover across services
- Attackers gaining access to personal data across platforms
In this setup, your primary account becomes a single point of failure.
The Domino Effect
- Attacker compromises your Google/Facebook account
- They review which apps are connected
- They log into those apps using social login
- They access sensitive data across multiple services
- They potentially use those accounts for further attacks
Hidden Permissions Most Users Don’t Review
Permissions are often granted once and then forgotten.
Some apps may retain access to:
- Your basic profile information
- Ongoing account access for login
- Data that is no longer necessary for the app to function
- Ability to post or act on your behalf
- Access to your contacts or friends list
Even if the app is no longer installed or used, the connection may still exist.
This is why periodic review is important.
What You Might Have Missed
- Apps you used once years ago may still have access
- Permissions may have expanded over time
- You may have granted access to apps that no longer exist
- Your social login is used on sites you don’t remember
Why This Risk Is Often Overlooked
Social login feels safe because it comes from trusted platforms. But the risk doesn’t always come from the platform itself—it comes from how connected apps use the access granted to them.
Many users:
- Trust apps without reviewing permissions
- Don’t revisit connected account settings
- Assume access is removed automatically
- Don’t realize permissions can be long-lived
- Underestimate what apps can access
As a result, old or unused connections can remain active in the background.
How to Check and Manage Connected Apps
You can review and remove connected apps directly from your account settings.
For Google Accounts
Steps:
- Go to your Google Account (myaccount.google.com)
- Navigate to Security on the left sidebar
- Scroll to “Third-party apps with account access”
- Click “Manage third-party access”
- Review the list of connected apps
- Click on any app to see what permissions it has
- Click “Remove Access” for apps you don’t use or trust
What to look for:
- Apps you no longer recognize
- Apps you haven’t used in years
- Apps with excessive permissions
- Apps that seem suspicious
For Facebook Accounts
Steps:
- Go to Facebook Settings
- Click “Apps and Websites” in the left menu
- You’ll see two tabs:
- Active — apps currently connected
- Expired — apps with expired access
- Review both lists
- Click “Remove” for apps you don’t need
- For important apps, click “View and Edit” to see permissions
What to look for:
- Apps that can post on your behalf
- Apps with access to your friends list
- Apps you added years ago
- Games or quizzes that may no longer be maintained
For Apple ID
Steps:
- Go to appleid.apple.com
- Sign in with your Apple ID
- Navigate to “Sign in with Apple”
- Review the list of connected apps
- Click “Manage” for any app
- You can stop using Apple ID or revoke access
How to Use Social Login More Safely
You don’t need to avoid social login completely—but you should use it carefully.
Best Practices
1. Only use social login for trusted services
- Stick to well-known, reputable apps and websites
- Be cautious with small or unfamiliar services
2. Review permissions before accepting
- Read what access is being requested
- Ask yourself: does this app need this information?
- If permissions seem excessive, consider using a different login method
3. Regularly remove unused connected apps
- Set a reminder to review every 3-6 months
- Remove anything you no longer use
- Check both Google and Facebook connections
4. Enable two-factor authentication on your main account
- Protects your primary account from unauthorized access
- Adds critical protection even if your password is compromised
5. Avoid linking critical accounts
- Don’t use social login for banking, financial services, or healthcare
- Use dedicated email and password for sensitive accounts
6. Use a password manager for separate accounts
- Makes it easy to create and manage unique credentials
- Avoids the centralization risk of social login
When You Should Avoid Social Login
There are situations where creating a separate account may be safer:
- For sensitive services — banking, financial accounts, healthcare
- When an app requests excessive permissions — if it wants more than it reasonably needs
- If you don’t fully trust the platform — be cautious with new or unfamiliar services
- For work-related accounts — keep professional accounts separate
- When the app will have access to sensitive data — email content, contacts, files
In these cases, using a dedicated email and password adds an extra layer of separation.
Real-World Incidents
App Developer Misuse
There have been cases where app developers:
- Collected more data than needed
- Sold user data to third parties
- Kept access tokens after users stopped using the app
- Used permissions for unauthorized purposes
Account Takeovers
Attackers who compromise a social media account often:
- Check connected apps for other entry points
- Use social login to access linked services
- Exploit permissions to spread malware or spam
Social Login Privacy Checklist
Use this checklist to secure your social login connections:
- Review Google connected apps (myaccount.google.com/security)
- Review Facebook connected apps (Settings → Apps and Websites)
- Remove apps you no longer use
- Check permissions for apps you keep
- Enable 2FA on your Google/Facebook account
- Use separate accounts for sensitive services
- Review connected apps every 3-6 months
- Be selective about new connections
- Watch for excessive permission requests
- Consider using a password manager for separate accounts
Frequently Asked Questions
Q: Is social login less secure than creating a separate account?
Not inherently. The security depends on how you manage it. Social login with 2FA on your main account can be very secure—but it creates centralization risk.
Q: Can apps see my password when I use social login?
No. The app never sees your password. OAuth uses tokens that grant limited, revocable access.
Q: What happens if I remove an app’s access?
You’ll be logged out of that service and it can no longer access your information. You can reconnect later if needed.
Q: Can apps access my data after I stop using them?
Yes, if you don’t revoke access. Permissions remain active until you manually remove them.
Q: Should I use social login for banking?
Generally, no. Use dedicated credentials for sensitive financial accounts.
Q: How do I know what permissions an app has?
Check your Google or Facebook connected apps section. Each app shows what access it has been granted.
Q: What’s the difference between “Sign in with Google” and “Sign in with Facebook”?
They work similarly but access different data from each platform. Choose the one you trust more.
Q: Can I use social login without sharing my email?
Some platforms allow limited access, but email is usually required for account creation.
Final Thought
Social login is designed for convenience—but it also creates connections between your accounts that can increase risk if not managed properly.
Key takeaways:
- Apps retain access until you revoke it
- Your main account becomes a single point of failure
- Permissions are often granted without review
- Regular audits reduce exposure
The key is not to avoid it entirely, but to stay aware of how it works, what access you’ve granted, and which apps are still connected.
A few minutes spent reviewing your account settings can help reduce unnecessary exposure and keep your digital identity more secure.
🔐 Take control of your connected accounts. Download our “Social Login Security Guide” with step-by-step instructions for Google, Facebook, and Apple.
Related Resources
Internal Cyvack Guides
- Your Old Accounts Could Be a Security Risk — Why Dormant Accounts Get Hijacked First
- Your Password Manager Could Be a Target — The Risk Most Users Overlook
- Hackers Are Stealing Google Accounts Using Session Cookie Attacks — How to Protect Your Login
- Your Browser Autofill Could Be Leaking Personal Data — The Hidden Security Risk Most Users Ignore
- Signing in With Google or Facebook Could Be Risky — What Most People Don’t Realize
Platform Security Resources
Google Account Security
Facebook Account Security
Apple ID Security
OAuth and Security Resources
- OAuth 2.0 Overview
- What is OAuth? - Technical specification
- Third-Party App Security - CISA guidance
