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High severityNVD Advisory· Published Dec 8, 2020· Updated Aug 4, 2024

omniauth-apple allows attacker to fake their email address during authentication

CVE-2020-26254

Description

omniauth-apple is the OmniAuth strategy for "Sign In with Apple" (RubyGem omniauth-apple). In omniauth-apple before version 1.0.1 attackers can fake their email address during authentication. This vulnerability impacts applications using the omniauth-apple strategy of OmniAuth and using the info.email field of OmniAuth's Auth Hash Schema for any kind of identification. The value of this field may be set to any value of the attacker's choice including email addresses of other users. Applications not using info.email for identification but are instead using the uid field are not impacted in the same manner. Note, these applications may still be negatively affected if the value of info.email is being used for other purposes. Applications using affected versions of omniauth-apple are advised to upgrade to omniauth-apple version 1.0.1 or later.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
omniauth-appleRubyGems
< 1.0.11.0.1

Affected products

1

Patches

1
b37d5409213a

Use only verified email address to prevent fake email address

https://github.com/nhosoya/omniauth-applenhosoyaDec 2, 2020via ghsa
commit
2 files changed · +16 −1
  • lib/omniauth/strategies/apple.rb+1 −1 modified
    @@ -104,7 +104,7 @@ def user_info
       end
 
       def email
-        user_info['email'] || id_info['email']
+        id_info['email']
       end
 
       def first_name
  • spec/omniauth/strategies/apple_spec.rb+15 −0 modified
    @@ -252,6 +252,21 @@
       end
     end
 
+    context 'with a spoofed email in the user payload' do
+      before do
+        request.params['user'] = {
+          name: {
+            firstName: 'first',
+            lastName: 'last'
+          },
+          email: "spoofed@example.com"
+        }.to_json
+      end
+
+      it 'should return the true email' do
+        expect(subject.info[:email]).to eq('something@privatrerelay.appleid.com')
+      end
+    end
   end
 
   describe '#extra' do

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

6

News mentions

0

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