diff --git a/apps/api/plane/api/urls/issue.py b/apps/api/plane/api/urls/issue.py
index c8d1ea4afe1..df64684de23 100644
--- a/apps/api/plane/api/urls/issue.py
+++ b/apps/api/plane/api/urls/issue.py
@@ -89,7 +89,9 @@
     ),
     path(
         "workspaces/<str:slug>/projects/<uuid:project_id>/issues/<uuid:issue_id>/issue-attachments/<uuid:pk>/",
-        IssueAttachmentDetailAPIEndpoint.as_view(http_method_names=["get", "delete"]),
+        IssueAttachmentDetailAPIEndpoint.as_view(
+            http_method_names=["get", "patch", "delete"]
+        ),
         name="issue-attachment",
     ),
 ]
diff --git a/apps/api/plane/api/views/issue.py b/apps/api/plane/api/views/issue.py
index 94dc9e1d030..20db26dd6e0 100644
--- a/apps/api/plane/api/views/issue.py
+++ b/apps/api/plane/api/views/issue.py
@@ -75,7 +75,7 @@
 from .base import BaseAPIView
 from plane.utils.host import base_host
 from plane.bgtasks.webhook_task import model_activity
-
+from plane.app.permissions import ROLE
 from plane.utils.openapi import (
     work_item_docs,
     label_docs,
@@ -145,6 +145,22 @@
 )
 from plane.bgtasks.work_item_link_task import crawl_work_item_link_title
 
+def user_has_issue_permission(
+    user_id, project_id, issue=None, allowed_roles=None, allow_creator=True
+):
+    if allow_creator and issue is not None and user_id == issue.created_by_id:
+        return True
+
+    qs = ProjectMember.objects.filter(
+        project_id=project_id,
+        member_id=user_id,
+        is_active=True,
+    )
+    if allowed_roles is not None:
+        qs = qs.filter(role__in=allowed_roles)
+
+    return qs.exists()
+
 
 class WorkspaceIssueAPIEndpoint(BaseAPIView):
     """
@@ -1782,7 +1798,6 @@ class IssueAttachmentListCreateAPIEndpoint(BaseAPIView):
 
     serializer_class = IssueAttachmentSerializer
     model = FileAsset
-    permission_classes = [ProjectEntityPermission]
     use_read_replica = True
 
     @issue_attachment_docs(
@@ -1865,6 +1880,22 @@ def post(self, request, slug, project_id, issue_id):
         Generate presigned URL for uploading file attachments to a work item.
         Validates file type and size before creating the attachment record.
         """
+        issue = Issue.objects.get(
+            pk=issue_id, workspace__slug=slug, project_id=project_id
+        )
+        # if the user is creator or admin,member then allow the upload
+        if not user_has_issue_permission(
+            request.user.id,
+            project_id=project_id,
+            issue=issue,
+            allowed_roles=[ROLE.ADMIN.value, ROLE.MEMBER.value],
+            allow_creator=True,
+        ):
+            return Response(
+                {"error": "You are not allowed to upload this attachment"},
+                status=status.HTTP_403_FORBIDDEN,
+            )
+
         name = request.data.get("name")
         type = request.data.get("type", False)
         size = request.data.get("size")
@@ -1989,7 +2020,6 @@ class IssueAttachmentDetailAPIEndpoint(BaseAPIView):
     """Issue Attachment Detail Endpoint"""
 
     serializer_class = IssueAttachmentSerializer
-    permission_classes = [ProjectEntityPermission]
     model = FileAsset
     use_read_replica = True
 
@@ -2012,6 +2042,22 @@ def delete(self, request, slug, project_id, issue_id, pk):
         Soft delete an attachment from a work item by marking it as deleted.
         Records deletion activity and triggers metadata cleanup.
         """
+        issue = Issue.objects.get(
+            pk=issue_id, workspace__slug=slug, project_id=project_id
+        )
+        # if the request user is creator or admin then delete the attachment
+        if not user_has_issue_permission(
+            request.user,
+            project_id=project_id,
+            issue=issue,
+            allowed_roles=[ROLE.ADMIN.value],
+            allow_creator=True,
+        ):
+            return Response(
+                {"error": "You are not allowed to delete this attachment"},
+                status=status.HTTP_403_FORBIDDEN,
+            )
+
         issue_attachment = FileAsset.objects.get(
             pk=pk, workspace__slug=slug, project_id=project_id
         )
@@ -2074,6 +2120,19 @@ def get(self, request, slug, project_id, issue_id, pk):
 
         Retrieve details of a specific attachment.
         """
+        # if the user is part of the project then allow the download
+        if not user_has_issue_permission(
+            request.user,
+            project_id=project_id,
+            issue=None,
+            allowed_roles=None,
+            allow_creator=False,
+        ):
+            return Response(
+                {"error": "You are not allowed to download this attachment"},
+                status=status.HTTP_403_FORBIDDEN,
+            )
+
         # Get the asset
         asset = FileAsset.objects.get(
             id=pk, workspace__slug=slug, project_id=project_id
@@ -2128,6 +2187,23 @@ def patch(self, request, slug, project_id, issue_id, pk):
         Mark an attachment as uploaded after successful file transfer to storage.
         Triggers activity logging and metadata extraction.
         """
+
+        issue = Issue.objects.get(
+            pk=issue_id, workspace__slug=slug, project_id=project_id
+        )
+        # if the user is creator or admin then allow the upload
+        if not user_has_issue_permission(
+            request.user,
+            project_id=project_id,
+            issue=issue,
+            allowed_roles=[ROLE.ADMIN.value, ROLE.MEMBER.value],
+            allow_creator=True,
+        ):
+            return Response(
+                {"error": "You are not allowed to upload this attachment"},
+                status=status.HTTP_403_FORBIDDEN,
+            )
+
         issue_attachment = FileAsset.objects.get(
             pk=pk, workspace__slug=slug, project_id=project_id
         )