diff --git a/src/shared/Core.Tests/InputArgumentsTests.cs b/src/shared/Core.Tests/InputArgumentsTests.cs
index 37fe4c5f3..44d8bae44 100644
--- a/src/shared/Core.Tests/InputArgumentsTests.cs
+++ b/src/shared/Core.Tests/InputArgumentsTests.cs
@@ -9,19 +9,25 @@ public class InputArgumentsTests
         [Fact]
         public void InputArguments_Ctor_Null_ThrowsArgNullException()
         {
-            Assert.Throws<ArgumentNullException>(() => new InputArguments(null));
+            Assert.Throws<ArgumentNullException>(() => new InputArguments((IDictionary<string, string>)null));
+            Assert.Throws<ArgumentNullException>(() => new InputArguments((IDictionary<string, IList<string>>)null));
         }
 
         [Fact]
         public void InputArguments_CommonArguments_ValuePresent_ReturnsValues()
         {
-            var dict = new Dictionary<string, string>
+            var dict = new Dictionary<string, IList<string>>
             {
-                ["protocol"] = "https",
-                ["host"]     = "example.com",
-                ["path"]     = "an/example/path",
-                ["username"] = "john.doe",
-                ["password"] = "password123"
+                ["protocol"] = new[] { "https" },
+                ["host"]     = new[] { "example.com" },
+                ["path"]     = new[] { "an/example/path" },
+                ["username"] = new[] { "john.doe" },
+                ["password"] = new[] { "password123" },
+                ["wwwauth"]  = new[]
+                {
+                    "basic realm=\"example.com\"",
+                    "bearer authorize_uri=https://id.example.com p=1 q=0"
+                }
             };
 
             var inputArgs = new InputArguments(dict);
@@ -31,10 +37,16 @@ public void InputArguments_CommonArguments_ValuePresent_ReturnsValues()
             Assert.Equal("an/example/path", inputArgs.Path);
             Assert.Equal("john.doe",        inputArgs.UserName);
             Assert.Equal("password123",     inputArgs.Password);
+            Assert.Equal(new[]
+                {
+                    "basic realm=\"example.com\"",
+                    "bearer authorize_uri=https://id.example.com p=1 q=0"
+                },
+                inputArgs.WwwAuth);
         }
 
         [Fact]
-        public void InputArguments_CommonArguments_ValueMissing_ReturnsNull()
+        public void InputArguments_CommonArguments_ValueMissing_ReturnsNullOrEmptyCollection()
         {
             var dict = new Dictionary<string, string>();
 
@@ -45,20 +57,23 @@ public void InputArguments_CommonArguments_ValueMissing_ReturnsNull()
             Assert.Null(inputArgs.Path);
             Assert.Null(inputArgs.UserName);
             Assert.Null(inputArgs.Password);
+            Assert.Empty(inputArgs.WwwAuth);
         }
 
         [Fact]
         public void InputArguments_OtherArguments()
         {
-            var dict = new Dictionary<string, string>
+            var dict = new Dictionary<string, IList<string>>
             {
-                ["foo"] = "bar"
+                ["foo"] = new[] { "bar" },
+                ["multi"] = new[] { "val1", "val2", "val3" },
             };
 
             var inputArgs = new InputArguments(dict);
 
             Assert.Equal("bar", inputArgs["foo"]);
             Assert.Equal("bar", inputArgs.GetArgumentOrDefault("foo"));
+            Assert.Equal(new[] { "val1", "val2", "val3" }, inputArgs.GetMultiArgumentOrDefault("multi"));
         }
 
         [Fact]
diff --git a/src/shared/Core/Commands/GitCommandBase.cs b/src/shared/Core/Commands/GitCommandBase.cs
index b186ce024..b277d1a75 100644
--- a/src/shared/Core/Commands/GitCommandBase.cs
+++ b/src/shared/Core/Commands/GitCommandBase.cs
@@ -33,7 +33,7 @@ internal async Task ExecuteAsync()
 
             // Parse standard input arguments
             // git-credential treats the keys as case-sensitive; so should we.
-            IDictionary<string, string> inputDict = await Context.Streams.In.ReadDictionaryAsync(StringComparer.Ordinal);
+            IDictionary<string, IList<string>> inputDict = await Context.Streams.In.ReadMultiDictionaryAsync(StringComparer.Ordinal);
             var input = new InputArguments(inputDict);
 
             // Validate minimum arguments are present
diff --git a/src/shared/Core/InputArguments.cs b/src/shared/Core/InputArguments.cs
index 53aab181a..626fc805d 100644
--- a/src/shared/Core/InputArguments.cs
+++ b/src/shared/Core/InputArguments.cs
@@ -15,17 +15,24 @@ namespace GitCredentialManager
     /// </remarks>
     public class InputArguments
     {
-        private readonly IReadOnlyDictionary<string, string> _dict;
+        private readonly IReadOnlyDictionary<string, IList<string>> _dict;
 
         public InputArguments(IDictionary<string, string> dict)
         {
-            if (dict == null)
-            {
-                throw new ArgumentNullException(nameof(dict));
-            }
+            EnsureArgument.NotNull(dict, nameof(dict));
+
+            // Transform input from 1:1 to 1:n and store as readonly
+            _dict = new ReadOnlyDictionary<string, IList<string>>(
+                dict.ToDictionary(x => x.Key, x => (IList<string>)new[] { x.Value })
+            );
+        }
+
+        public InputArguments(IDictionary<string, IList<string>> dict)
+        {
+            EnsureArgument.NotNull(dict, nameof(dict));
 
             // Wrap the dictionary internally as readonly
-            _dict = new ReadOnlyDictionary<string, string>(dict);
+            _dict = new ReadOnlyDictionary<string, IList<string>>(dict);
         }
 
         #region Common Arguments
@@ -35,6 +42,7 @@ public InputArguments(IDictionary<string, string> dict)
         public string Path     => GetArgumentOrDefault("path");
         public string UserName => GetArgumentOrDefault("username");
         public string Password => GetArgumentOrDefault("password");
+        public IList<string> WwwAuth => GetMultiArgumentOrDefault("wwwauth");
 
         #endregion
 
@@ -50,9 +58,33 @@ public string GetArgumentOrDefault(string key)
             return TryGetArgument(key, out string value) ? value : null;
         }
 
+        public IList<string> GetMultiArgumentOrDefault(string key)
+        {
+            return TryGetMultiArgument(key, out IList<string> values) ? values : Array.Empty<string>();
+        }
+
         public bool TryGetArgument(string key, out string value)
         {
-            return _dict.TryGetValue(key, out value);
+            if (_dict.TryGetValue(key, out IList<string> values))
+            {
+                value = values.FirstOrDefault();
+                return value != null;
+            }
+
+            value = null;
+            return false;
+        }
+
+        public bool TryGetMultiArgument(string key, out IList<string> value)
+        {
+            if (_dict.TryGetValue(key, out IList<string> values))
+            {
+                value = values;
+                return true;
+            }
+
+            value = null;
+            return false;
         }
 
         public bool TryGetHostAndPort(out string host, out int? port)
diff --git a/src/shared/Core/Trace.cs b/src/shared/Core/Trace.cs
index 86a1ec698..37f0de417 100644
--- a/src/shared/Core/Trace.cs
+++ b/src/shared/Core/Trace.cs
@@ -217,24 +217,25 @@ public void WriteDictionarySecrets<TKey, TValue>(
                 bool isSecretEntry = !(secretKeys is null) &&
                                      secretKeys.Contains(entry.Key, keyComparer ?? EqualityComparer<TKey>.Default);
 
-                void WriteSecretLine(object value)
+                void WriteSecretLine(string keySuffix, object value)
                 {
                     var message = isSecretEntry && !IsSecretTracingEnabled
-                        ? $"\t{entry.Key}={SecretMask}"
-                        : $"\t{entry.Key}={value}";
+                        ? $"\t{entry.Key}{keySuffix}={SecretMask}"
+                        : $"\t{entry.Key}{keySuffix}={value}";
                     WriteLine(message, filePath, lineNumber, memberName);
                 }
 
                 if (entry.Value is IEnumerable<string> values)
                 {
-                    foreach (string value in values)
+                    List<string> valueList = values.ToList();
+                    foreach (string value in valueList)
                     {
-                        WriteSecretLine(value);
+                        WriteSecretLine(valueList.Count > 1 ? "[]" : string.Empty, value);
                     }
                 }
                 else
                 {
-                    WriteSecretLine(entry.Value);
+                    WriteSecretLine(string.Empty, entry.Value);
                 }
             }
         }