diff --git a/zap/src/main/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParameters.java b/zap/src/main/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParameters.java
index ce0c9c3eb8f..df402dd8057 100644
--- a/zap/src/main/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParameters.java
+++ b/zap/src/main/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParameters.java
@@ -79,7 +79,7 @@ public void setMessage(HttpMessage msg) {
         }
 
         try {
-            parseImpl(msg, contentType);
+            parseImpl(msg, msg.getRequestHeader().getHeader(HttpHeader.CONTENT_TYPE));
         } catch (Exception e) {
             LOGGER.error("An error occurred while parsing multipart content:", e);
         }
diff --git a/zap/src/test/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParametersUnitTest.java b/zap/src/test/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParametersUnitTest.java
index 205d950a41c..edeb74087f4 100644
--- a/zap/src/test/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParametersUnitTest.java
+++ b/zap/src/test/java/org/parosproxy/paros/core/scanner/VariantMultipartFormParametersUnitTest.java
@@ -36,6 +36,7 @@
 import org.parosproxy.paros.network.HttpHeader;
 import org.parosproxy.paros.network.HttpMalformedHeaderException;
 import org.parosproxy.paros.network.HttpMessage;
+import org.parosproxy.paros.network.HttpRequestHeader;
 import org.zaproxy.zap.core.scanner.InputVector.PayloadFormat;
 import org.zaproxy.zap.core.scanner.InputVectorBuilder;
 
@@ -312,6 +313,53 @@ void shouldExtractParametersFromAllPartsEvenIfSomeAreEmpty() {
                 is(equalTo(NameValuePair.TYPE_MULTIPART_DATA_FILE_PARAM)));
     }
 
+    @Test
+    void shouldExtractParametersWhenBoundyHasMixedCapitalization()
+            throws HttpMalformedHeaderException {
+        // Given
+        VariantMultipartFormParameters variant = new VariantMultipartFormParameters();
+        HttpRequestHeader reqHdr =
+                new HttpRequestHeader(
+                        """
+                        POST https://127.0.0.1:8000/login HTTP/1.1
+                        host: 127.0.0.1:8000
+                        User-Agent: curl/8.7.1
+                        Accept: */*
+                        Content-Length: 282
+                        Content-Type: multipart/form-data; boundary=------------------------o4XsAqQ54LPupcrI0dfahp
+                        """);
+        String body =
+                """
+                --------------------------o4XsAqQ54LPupcrI0dfahp\r
+                Content-Disposition: form-data; name="email"\r
+                \r
+                test@example.com\r
+                --------------------------o4XsAqQ54LPupcrI0dfahp\r
+                Content-Disposition: form-data; name="password"\r
+                \r
+                testpass123\r
+                --------------------------o4XsAqQ54LPupcrI0dfahp--\r
+                \r
+                """;
+        HttpMessage message = new HttpMessage(reqHdr);
+        message.setRequestBody(body);
+        // When
+        variant.setMessage(message);
+        // Then
+        assertThat(variant.getParamList().get(0).getPosition(), is(equalTo(1)));
+        assertThat(variant.getParamList().get(0).getName(), is(equalTo("email")));
+        assertThat(variant.getParamList().get(0).getValue(), is(equalTo("test@example.com")));
+        assertThat(
+                variant.getParamList().get(0).getType(),
+                is(equalTo(NameValuePair.TYPE_MULTIPART_DATA_PARAM)));
+        assertThat(variant.getParamList().get(1).getPosition(), is(equalTo(2)));
+        assertThat(variant.getParamList().get(1).getName(), is(equalTo("password")));
+        assertThat(variant.getParamList().get(1).getValue(), is(equalTo("testpass123")));
+        assertThat(
+                variant.getParamList().get(1).getType(),
+                is(equalTo(NameValuePair.TYPE_MULTIPART_DATA_PARAM)));
+    }
+
     @Test
     void shouldInjectParamValueModificationInGeneralParam() {
         // Given