diff --git a/hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/signature/StringToSignProducer.java b/hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/signature/StringToSignProducer.java
index f308363133de..ca1eb8f1fd02 100644
--- a/hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/signature/StringToSignProducer.java
+++ b/hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/signature/StringToSignProducer.java
@@ -57,6 +57,7 @@
 public final class StringToSignProducer {
 
   public static final String X_AMAZ_DATE = "x-amz-date";
+  private static final String X_AMZ_ACL = "x-amz-acl";
   private static final Logger LOG =
       LoggerFactory.getLogger(StringToSignProducer.class);
   private static final Charset UTF_8 = StandardCharsets.UTF_8;
@@ -370,8 +371,8 @@ private static void validateCanonicalHeaders(
       if (!(canonicalHeaders.contains(header + ":"))) {
         // According to AWS Signature V4 documentation using Authorization Header
         // https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
-        // The x-amz-content-sha256 header is not required for CanonicalHeaders
-        if (X_AMZ_CONTENT_SHA256.equals(header)) {
+        // The x-amz-content-sha256 and x-amz-acl header is not required for CanonicalHeaders
+        if (X_AMZ_CONTENT_SHA256.equals(header) || X_AMZ_ACL.equals(header)) {
           continue;
         }
         LOG.error("The SignedHeaders list must include all "
diff --git a/hadoop-ozone/s3gateway/src/test/java/org/apache/hadoop/ozone/s3/signature/TestStringToSignProducer.java b/hadoop-ozone/s3gateway/src/test/java/org/apache/hadoop/ozone/s3/signature/TestStringToSignProducer.java
index cbce030ef69f..e8646833f930 100644
--- a/hadoop-ozone/s3gateway/src/test/java/org/apache/hadoop/ozone/s3/signature/TestStringToSignProducer.java
+++ b/hadoop-ozone/s3gateway/src/test/java/org/apache/hadoop/ozone/s3/signature/TestStringToSignProducer.java
@@ -269,4 +269,45 @@ public void testValidateCanonicalHeaders(
 
     assertEquals(expectedResult, actualResult);
   }
+
+  @Test
+  public void testUnsignedPayloadBypassesXAmzHeaderCheck() throws Exception {
+    // We add an x-amz-acl header that is NOT in SignedHeaders
+    String authHeader = "AWS4-HMAC-SHA256 Credential=ozone/"
+        + DATE_FORMATTER.format(LocalDate.now())
+        + "/us-east-1/s3/aws4_request, "
+        + "SignedHeaders=host, "
+        + "Signature=db81b057718d7c1b3b" +
+        "8dffa29933099551c51d787b3b13b9e0f9ebed45982bf2";
+
+    MultivaluedMap<String, String> headerMap = new MultivaluedHashMap<>();
+    headerMap.putSingle("Authorization", authHeader);
+    headerMap.putSingle("host", "0.0.0.0:9878");
+    // Extra unsigned header
+    headerMap.putSingle("x-amz-acl", "public-read");
+
+    ContainerRequestContext context = setupContext(
+        new URI("https://0.0.0.0:9878/"),
+        "PUT",
+        headerMap,
+        new MultivaluedHashMap<>());
+
+    // Simulate query parameter authentication where signPayload is false
+    SignatureInfo signatureInfo = new SignatureInfo.Builder(SignatureInfo.Version.V4)
+        .setDate(LocalDate.now().format(DATE_FORMATTER))
+        .setDateTime(DATETIME)
+        .setAwsAccessId("ozone")
+        .setSignature("dummy")
+        .setSignedHeaders("host")
+        .setCredentialScope("ozone/" + DATE_FORMATTER.format(LocalDate.now()) + "/us-east-1/s3/aws4_request")
+        .setAlgorithm(SignatureProcessor.AWS4_SIGNING_ALGORITHM)
+        // This makes unsignedPayload = true in createSignatureBase
+        .setSignPayload(false) 
+        .build();
+    signatureInfo.setUnfilteredURI("/");
+
+    // This should NOT throw an exception bypasses the strict
+    // x-amz-* header validation.
+    StringToSignProducer.createSignatureBase(signatureInfo, context);
+  }
 }