diff --git a/backend/open_webui/routers/audio.py b/backend/open_webui/routers/audio.py
index 9c84f9c704..7caf57b0aa 100644
--- a/backend/open_webui/routers/audio.py
+++ b/backend/open_webui/routers/audio.py
@@ -33,6 +33,7 @@ from fastapi.responses import FileResponse
 from pydantic import BaseModel
 
 
+from open_webui.utils.misc import strict_match_mime_type
 from open_webui.utils.auth import get_admin_user, get_verified_user
 from open_webui.utils.headers import include_user_info_headers
 from open_webui.config import (
@@ -1155,17 +1156,9 @@ def transcription(
 
     stt_supported_content_types = getattr(
         request.app.state.config, "STT_SUPPORTED_CONTENT_TYPES", []
-    )
+    ) or ["audio/*", "video/webm"]
 
-    if not any(
-        fnmatch(file.content_type, content_type)
-        for content_type in (
-            stt_supported_content_types
-            if stt_supported_content_types
-            and any(t.strip() for t in stt_supported_content_types)
-            else ["audio/*", "video/webm"]
-        )
-    ):
+    if not strict_match_mime_type(stt_supported_content_types, file.content_type):
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
             detail=ERROR_MESSAGES.FILE_NOT_SUPPORTED,
diff --git a/backend/open_webui/routers/files.py b/backend/open_webui/routers/files.py
index 3bb28b95d6..6eb7a19cbc 100644
--- a/backend/open_webui/routers/files.py
+++ b/backend/open_webui/routers/files.py
@@ -47,7 +47,7 @@ from open_webui.storage.provider import Storage
 
 from open_webui.utils.auth import get_admin_user, get_verified_user
 from open_webui.utils.access_control import has_access
-
+from open_webui.utils.misc import strict_match_mime_type
 from pydantic import BaseModel
 
 log = logging.getLogger(__name__)
@@ -108,17 +108,9 @@ def process_uploaded_file(request, file, file_path, file_item, file_metadata, us
         if file.content_type:
             stt_supported_content_types = getattr(
                 request.app.state.config, "STT_SUPPORTED_CONTENT_TYPES", []
-            )
+            ) or ["audio/*", "video/webm"]
 
-            if any(
-                fnmatch(file.content_type, content_type)
-                for content_type in (
-                    stt_supported_content_types
-                    if stt_supported_content_types
-                    and any(t.strip() for t in stt_supported_content_types)
-                    else ["audio/*", "video/webm"]
-                )
-            ):
+            if strict_match_mime_type(stt_supported_content_types, file.content_type):
                 file_path = Storage.get_file(file_path)
                 result = transcribe(request, file_path, file_metadata, user)
 
diff --git a/backend/open_webui/utils/misc.py b/backend/open_webui/utils/misc.py
index 21943caff8..e0e21249f6 100644
--- a/backend/open_webui/utils/misc.py
+++ b/backend/open_webui/utils/misc.py
@@ -9,6 +9,7 @@ from pathlib import Path
 from typing import Callable, Optional, Sequence, Union
 import json
 import aiohttp
+import mimeparse
 
 
 import collections.abc
@@ -577,6 +578,37 @@ def throttle(interval: float = 10.0):
     return decorator
 
 
+def strict_match_mime_type(supported: list[str] | str, header: str) -> Optional[str]:
+    """
+    Strictly match the mime type with the supported mime types.
+
+    :param supported: The supported mime types.
+    :param header: The header to match.
+    :return: The matched mime type or None if no match is found.
+    """
+
+    try:
+        if isinstance(supported, str):
+            supported = supported.split(",")
+
+        supported = [s for s in supported if s.strip() and "/" in s]
+
+        match = mimeparse.best_match(supported, header)
+        if not match:
+            return None
+
+        _, _, match_params = mimeparse.parse_mime_type(match)
+        _, _, header_params = mimeparse.parse_mime_type(header)
+        for k, v in match_params.items():
+            if header_params.get(k) != v:
+                return None
+
+        return match
+    except Exception as e:
+        log.exception(f"Failed to match mime type {header}: {e}")
+        return None
+
+
 def extract_urls(text: str) -> list[str]:
     # Regex pattern to match URLs
     url_pattern = re.compile(
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 558b6ecc46..b337a5f8b5 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -20,6 +20,7 @@ aiofiles
 starlette-compress==1.6.1
 httpx[socks,http2,zstd,cli,brotli]==0.28.1
 starsessions[redis]==2.2.1
+python-mimeparse==2.0.0
 
 sqlalchemy==2.0.44
 alembic==1.17.2