diff --git a/model/oauth.go b/model/oauth.go
index 62943844..0c700455 100644
--- a/model/oauth.go
+++ b/model/oauth.go
@@ -1,6 +1,7 @@
 package model
 
 import (
+	"encoding/json"
 	"errors"
 	"strconv"
 	"strings"
@@ -112,7 +113,10 @@ type OauthUserBase struct {
 type OidcUser struct {
 	OauthUserBase
 	Sub               string `json:"sub"`
-	VerifiedEmail     bool   `json:"email_verified"`
+	// VerifiedEmail is declared as json.RawMessage because some OIDC providers
+	// (e.g. Amazon Cognito) return email_verified as a JSON string ("true"/"false")
+	// instead of a JSON boolean, which violates the OIDC Core spec (section 5.1).
+	VerifiedEmail     json.RawMessage `json:"email_verified"`
 	PreferredUsername string `json:"preferred_username"`
 	Picture           string `json:"picture"`
 }
@@ -126,12 +130,16 @@ func (ou *OidcUser) ToOauthUser() *OauthUser {
 		username = strings.ToLower(ou.Email)
 	}
 
+	// email_verified may be a JSON boolean or a JSON string depending on the provider.
+	// When the field is absent or null, ou.VerifiedEmail is nil and defaults to false.
+	verifiedEmail := strings.EqualFold(strings.Trim(string(ou.VerifiedEmail), `"`), "true")
+
 	return &OauthUser{
 		OpenId:        ou.Sub,
 		Name:          ou.Name,
 		Username:      username,
 		Email:         ou.Email,
-		VerifiedEmail: ou.VerifiedEmail,
+		VerifiedEmail: verifiedEmail,
 		Picture:       ou.Picture,
 	}
 }
diff --git a/model/oauth_test.go b/model/oauth_test.go
new file mode 100644
index 00000000..bad0bfc9
--- /dev/null
+++ b/model/oauth_test.go
@@ -0,0 +1,57 @@
+package model
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestOidcUser_ToOauthUser_EmailVerifiedBoolTrue(t *testing.T) {
+	u := &OidcUser{VerifiedEmail: json.RawMessage(`true`)}
+	if !u.ToOauthUser().VerifiedEmail {
+		t.Fatal("expected true for JSON boolean true")
+	}
+}
+
+func TestOidcUser_ToOauthUser_EmailVerifiedBoolFalse(t *testing.T) {
+	u := &OidcUser{VerifiedEmail: json.RawMessage(`false`)}
+	if u.ToOauthUser().VerifiedEmail {
+		t.Fatal("expected false for JSON boolean false")
+	}
+}
+
+func TestOidcUser_ToOauthUser_EmailVerifiedStringTrue(t *testing.T) {
+	u := &OidcUser{VerifiedEmail: json.RawMessage(`"true"`)}
+	if !u.ToOauthUser().VerifiedEmail {
+		t.Fatal("expected true for JSON string \"true\"")
+	}
+}
+
+func TestOidcUser_ToOauthUser_EmailVerifiedStringFalse(t *testing.T) {
+	u := &OidcUser{VerifiedEmail: json.RawMessage(`"false"`)}
+	if u.ToOauthUser().VerifiedEmail {
+		t.Fatal("expected false for JSON string \"false\"")
+	}
+}
+
+func TestOidcUser_ToOauthUser_EmailVerifiedStringCaseInsensitive(t *testing.T) {
+	for _, s := range []string{`"True"`, `"TRUE"`} {
+		u := &OidcUser{VerifiedEmail: json.RawMessage(s)}
+		if !u.ToOauthUser().VerifiedEmail {
+			t.Fatalf("expected true for %s", s)
+		}
+	}
+}
+
+func TestOidcUser_ToOauthUser_EmailVerifiedNull(t *testing.T) {
+	u := &OidcUser{VerifiedEmail: json.RawMessage(`null`)}
+	if u.ToOauthUser().VerifiedEmail {
+		t.Fatal("expected false for JSON null")
+	}
+}
+
+func TestOidcUser_ToOauthUser_EmailVerifiedAbsent(t *testing.T) {
+	u := &OidcUser{}
+	if u.ToOauthUser().VerifiedEmail {
+		t.Fatal("expected false when email_verified field is absent")
+	}
+}