CVE-2025-62593

@@ -307,7 +307,10 @@ async def browsers_no_post_put_middleware(request, handler):
             if (
                 # A best effort test for browser traffic. All common browsers
                 # start with Mozilla at the time of writing.
-                dashboard_optional_utils.is_browser_request(request)
+                (
+                    dashboard_optional_utils.is_browser_request(request)
+                    or dashboard_optional_utils.has_sec_fetch_headers(request)
+                )
                 and request.method in [hdrs.METH_POST, hdrs.METH_PUT]
             ):
                 return aiohttp.web.Response(

@@ -138,12 +138,30 @@ def is_browser_request(req: Request) -> bool:
     return req.headers["User-Agent"].startswith("Mozilla")
 
 
+def has_sec_fetch_headers(req: Request) -> bool:
+    """Checks for the existance of any of the sec-fetch-* headers"""
+    return any(
+        h in req.headers
+        for h in (
+            "Sec-Fetch-Mode",
+            "Sec-Fetch-Dest",
+            "Sec-Fetch-Site",
+            "Sec-Fetch-User",
+        )
+    )
+
+
 def deny_browser_requests() -> Callable:
     """Reject any requests that appear to be made by a browser"""
 
     def decorator_factory(f: Callable) -> Callable:
         @functools.wraps(f)
         async def decorator(self, req: Request):
+            if has_sec_fetch_headers(req):
+                return Response(
+                    text="Browser requests not allowed",
+                    status=aiohttp.web.HTTPMethodNotAllowed.status_code,
+                )
             if is_browser_request(req):
                 return Response(
                     text="Browser requests not allowed",

@@ -419,10 +419,16 @@ def test_browser_no_post_no_put(enable_test_module, ray_start_with_dashboard):
     webui_url = ray_start_with_dashboard["webui_url"]
     webui_url = format_web_url(webui_url)
 
+    def dashboard_available():
+        try:
+            return requests.get(webui_url).status_code == 200
+        except Exception:
+            return False
+
     timeout_seconds = 30
     start_time = time.time()
+    wait_for_condition(dashboard_available)
     while True:
-        time.sleep(3)
         try:
             # Starting and getting jobs should be fine from API clients
             response = requests.post(
@@ -458,6 +464,57 @@ def test_browser_no_post_no_put(enable_test_module, ray_start_with_dashboard):
                 raise Exception("Timed out while testing.")
 
 
+@pytest.mark.skipif(
+    os.environ.get("RAY_MINIMAL") == "1",
+    reason="This test is not supposed to work for minimal installation.",
+)
+def test_deny_fetch_requests(enable_test_module, ray_start_with_dashboard):
+    assert wait_until_server_available(ray_start_with_dashboard["webui_url"]) is True
+    webui_url = ray_start_with_dashboard["webui_url"]
+    webui_url = format_web_url(webui_url)
+
+    def dashboard_available():
+        try:
+            return requests.get(webui_url).status_code == 200
+        except Exception:
+            return False
+
+    timeout_seconds = 30
+    start_time = time.time()
+    wait_for_condition(dashboard_available)
+    while True:
+        try:
+            # Starting and getting jobs should be fine from API clients
+            response = requests.post(
+                webui_url + "/api/jobs/", json={"entrypoint": "ls"}
+            )
+            response.raise_for_status()
+            response = requests.get(webui_url + "/api/jobs/")
+            response.raise_for_status()
+
+            # Starting job should be blocked for browsers
+            response = requests.post(
+                webui_url + "/api/jobs/",
+                json={"entrypoint": "ls"},
+                headers={
+                    "User-Agent": ("Spurious User Agent"),
+                    "Sec-Fetch-Site": ("cross-site"),
+                },
+            )
+            with pytest.raises(HTTPError):
+                response.raise_for_status()
+
+            # Getting jobs should be fine for browsers
+            response = requests.get(webui_url + "/api/jobs/")
+            response.raise_for_status()
+            break
+        except (AssertionError, requests.exceptions.ConnectionError) as e:
+            logger.info("Retry because of %s", e)
+        finally:
+            if time.time() > start_time + timeout_seconds:
+                raise Exception("Timed out while testing.")
+
+
 @pytest.mark.skipif(
     os.environ.get("RAY_MINIMAL") == "1",
     reason="This test is not supposed to work for minimal installation.",