diff --git a/backend/open_webui/models/auths.py b/backend/open_webui/models/auths.py
index 0d0b881a78..8b03580e6c 100644
--- a/backend/open_webui/models/auths.py
+++ b/backend/open_webui/models/auths.py
@@ -88,7 +88,7 @@ class AuthsTable:
         name: str,
         profile_image_url: str = "/user.png",
         role: str = "pending",
-        oauth_sub: Optional[str] = None,
+        oauth: Optional[dict] = None,
     ) -> Optional[UserModel]:
         with get_db() as db:
             log.info("insert_new_auth")
@@ -102,7 +102,7 @@ class AuthsTable:
             db.add(result)
 
             user = Users.insert_new_user(
-                id, name, email, profile_image_url, role, oauth_sub
+                id, name, email, profile_image_url, role, oauth=oauth
             )
 
             db.commit()
diff --git a/backend/open_webui/models/users.py b/backend/open_webui/models/users.py
index b68b195cd2..6a2f3bc9b0 100644
--- a/backend/open_webui/models/users.py
+++ b/backend/open_webui/models/users.py
@@ -225,7 +225,7 @@ class UsersTable:
         email: str,
         profile_image_url: str = "/user.png",
         role: str = "pending",
-        oauth_sub: Optional[str] = None,
+        oauth: Optional[dict] = None,
     ) -> Optional[UserModel]:
         with get_db() as db:
             user = UserModel(
@@ -238,7 +238,7 @@ class UsersTable:
                     "last_active_at": int(time.time()),
                     "created_at": int(time.time()),
                     "updated_at": int(time.time()),
-                    "oauth_sub": oauth_sub,
+                    "oauth": oauth,
                 }
             )
             result = User(**user.model_dump())
@@ -274,11 +274,15 @@ class UsersTable:
         except Exception:
             return None
 
-    def get_user_by_oauth_sub(self, sub: str) -> Optional[UserModel]:
+    def get_user_by_oauth_sub(self, provider: str, sub: str) -> Optional[UserModel]:
         try:
             with get_db() as db:
-                user = db.query(User).filter_by(oauth_sub=sub).first()
-                return UserModel.model_validate(user)
+                user = (
+                    db.query(User)
+                    .filter(User.oauth.contains({provider: {"sub": sub}}))
+                    .first()
+                )
+                return UserModel.model_validate(user) if user else None
         except Exception:
             return None
 
@@ -493,16 +497,35 @@ class UsersTable:
         except Exception:
             return None
 
-    def update_user_oauth_sub_by_id(
-        self, id: str, oauth_sub: str
+    def update_user_oauth_by_id(
+        self, id: str, provider: str, sub: str
     ) -> Optional[UserModel]:
+        """
+        Update or insert an OAuth provider/sub pair into the user's oauth JSON field.
+        Example resulting structure:
+            {
+                "google": { "sub": "123" },
+                "github": { "sub": "abc" }
+            }
+        """
         try:
             with get_db() as db:
-                db.query(User).filter_by(id=id).update({"oauth_sub": oauth_sub})
+                user = db.query(User).filter_by(id=id).first()
+                if not user:
+                    return None
+
+                # Load existing oauth JSON or create empty
+                oauth = user.oauth or {}
+
+                # Update or insert provider entry
+                oauth[provider] = {"sub": sub}
+
+                # Persist updated JSON
+                db.query(User).filter_by(id=id).update({"oauth": oauth})
                 db.commit()
 
-                user = db.query(User).filter_by(id=id).first()
                 return UserModel.model_validate(user)
+
         except Exception:
             return None
 
diff --git a/backend/open_webui/utils/oauth.py b/backend/open_webui/utils/oauth.py
index f8a924e8d0..6bd955e90c 100644
--- a/backend/open_webui/utils/oauth.py
+++ b/backend/open_webui/utils/oauth.py
@@ -1329,7 +1329,10 @@ class OAuthManager:
                 log.warning(f"OAuth callback failed, sub is missing: {user_data}")
                 raise HTTPException(400, detail=ERROR_MESSAGES.INVALID_CRED)
 
-            provider_sub = f"{provider}@{sub}"
+            oauth_data = {}
+            oauth_data[provider] = {
+                "sub": sub,
+            }
 
             # Email extraction
             email_claim = auth_manager_config.OAUTH_EMAIL_CLAIM
@@ -1376,12 +1379,12 @@ class OAuthManager:
                         log.warning(f"Error fetching GitHub email: {e}")
                         raise HTTPException(400, detail=ERROR_MESSAGES.INVALID_CRED)
                 elif ENABLE_OAUTH_EMAIL_FALLBACK:
-                    email = f"{provider_sub}.local"
+                    email = f"{provider}@{sub}.local"
                 else:
                     log.warning(f"OAuth callback failed, email is missing: {user_data}")
                     raise HTTPException(400, detail=ERROR_MESSAGES.INVALID_CRED)
-            email = email.lower()
 
+            email = email.lower()
             # If allowed domains are configured, check if the email domain is in the list
             if (
                 "*" not in auth_manager_config.OAUTH_ALLOWED_DOMAINS
@@ -1394,7 +1397,7 @@ class OAuthManager:
                 raise HTTPException(400, detail=ERROR_MESSAGES.INVALID_CRED)
 
             # Check if the user exists
-            user = Users.get_user_by_oauth_sub(provider_sub)
+            user = Users.get_user_by_oauth_sub(provider, sub)
             if not user:
                 # If the user does not exist, check if merging is enabled
                 if auth_manager_config.OAUTH_MERGE_ACCOUNTS_BY_EMAIL:
@@ -1402,7 +1405,7 @@ class OAuthManager:
                     user = Users.get_user_by_email(email)
                     if user:
                         # Update the user with the new oauth sub
-                        Users.update_user_oauth_sub_by_id(user.id, provider_sub)
+                        Users.update_user_oauth_by_id(user.id, provider, sub)
 
             if user:
                 determined_role = self.get_user_role(user, user_data)
@@ -1461,7 +1464,7 @@ class OAuthManager:
                         name=name,
                         profile_image_url=picture_url,
                         role=self.get_user_role(None, user_data),
-                        oauth_sub=provider_sub,
+                        oauth=oauth_data,
                     )
 
                     if auth_manager_config.WEBHOOK_URL: