diff --git a/pyproject.toml b/pyproject.toml
index 204e77f..a87b46a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "govoplan-core"
-version = "0.1.31"
+version = "0.1.32"
 description = "Reusable GovOPlaN platform core, access, tenancy, and RBAC components."
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/src/govoplan_core/security/http_fetch.py b/src/govoplan_core/security/http_fetch.py
index 974b939..860a901 100644
--- a/src/govoplan_core/security/http_fetch.py
+++ b/src/govoplan_core/security/http_fetch.py
@@ -12,6 +12,9 @@ from govoplan_core.security.outbound_http import (
 )
 
 
+MAX_OUTBOUND_HTTP_REQUEST_BODY_BYTES = 1_000_000
+
+
 @dataclass(frozen=True, slots=True)
 class HttpFetchResponse:
     status: int
@@ -46,11 +49,17 @@ def fetch_http(
     label: str = "URL",
     method: str = "GET",
     headers: Mapping[str, str] | None = None,
+    body: bytes | None = None,
     max_bytes: int | None = None,
 ) -> HttpFetchResponse:
+    if body is not None and len(body) > MAX_OUTBOUND_HTTP_REQUEST_BODY_BYTES:
+        raise ValueError(
+            "Outbound HTTP request body exceeds the 1000000-byte safety limit."
+        )
     validated_url = validate_outbound_http_url(url, label=label)
     request = urllib.request.Request(  # noqa: S310 - URL is restricted to validated HTTP(S).
         validated_url,
+        data=body,
         headers=dict(headers or {}),
         method=method,
     )
@@ -76,10 +85,19 @@ def fetch_http_text(
     label: str = "URL",
     method: str = "GET",
     headers: Mapping[str, str] | None = None,
+    body: bytes | None = None,
     encoding: str = "utf-8",
     max_bytes: int | None = None,
 ) -> str:
-    return fetch_http(url, timeout=timeout, label=label, method=method, headers=headers, max_bytes=max_bytes).text(encoding)
+    return fetch_http(
+        url,
+        timeout=timeout,
+        label=label,
+        method=method,
+        headers=headers,
+        body=body,
+        max_bytes=max_bytes,
+    ).text(encoding)
 
 
 class _PolicyRedirectHandler(urllib.request.HTTPRedirectHandler):
diff --git a/tests/test_http_fetch.py b/tests/test_http_fetch.py
index cb54812..b6e8ba8 100644
--- a/tests/test_http_fetch.py
+++ b/tests/test_http_fetch.py
@@ -2,9 +2,14 @@ from __future__ import annotations
 
 import io
 import unittest
-from unittest.mock import patch
+from unittest.mock import Mock, patch
 
-from govoplan_core.security.http_fetch import _PolicyRedirectHandler, is_http_url, validate_http_url
+from govoplan_core.security.http_fetch import (
+    _PolicyRedirectHandler,
+    fetch_http,
+    is_http_url,
+    validate_http_url,
+)
 from govoplan_core.security.outbound_http import (
     DEFAULT_FILE_TRANSFER_BYTES,
     DEFAULT_STRUCTURED_RESPONSE_BYTES,
@@ -21,6 +26,51 @@ from govoplan_core.security.outbound_http import (
 
 
 class HttpFetchTests(unittest.TestCase):
+    def test_fetch_http_forwards_a_bounded_request_body(self) -> None:
+        class Response(io.BytesIO):
+            status = 200
+            headers = {"Content-Type": "application/json"}
+
+            def __enter__(self):
+                return self
+
+            def __exit__(self, *_args):
+                return False
+
+        opener = Mock()
+        opener.open.return_value = Response(b"{}")
+        with patch(
+            "govoplan_core.security.http_fetch.validate_outbound_http_url",
+            return_value="https://wiki.example.test/api.php",
+        ), patch(
+            "govoplan_core.security.http_fetch.build_outbound_http_opener",
+            return_value=opener,
+        ):
+            response = fetch_http(
+                "https://wiki.example.test/api.php",
+                method="POST",
+                headers={"Content-Type": "application/x-www-form-urlencoded"},
+                body=b"action=edit",
+                max_bytes=1024,
+            )
+
+        request = opener.open.call_args.args[0]
+        self.assertEqual("POST", request.get_method())
+        self.assertEqual(b"action=edit", request.data)
+        self.assertEqual(b"{}", response.body)
+
+    def test_fetch_http_rejects_an_oversized_request_body_before_transport(self) -> None:
+        with patch(
+            "govoplan_core.security.http_fetch.validate_outbound_http_url"
+        ) as validate:
+            with self.assertRaisesRegex(ValueError, "request body exceeds"):
+                fetch_http(
+                    "https://wiki.example.test/api.php",
+                    method="POST",
+                    body=b"x" * 1_000_001,
+                )
+        validate.assert_not_called()
+
     def test_validate_http_url_accepts_absolute_http_urls_without_credentials(self) -> None:
         self.assertEqual("https://example.test/catalog.json", validate_http_url("https://example.test/catalog.json"))
         self.assertTrue(is_http_url("http://example.test/catalog.json"))
diff --git a/webui/package-lock.json b/webui/package-lock.json
index 3d08c96..5b3ecf5 100644
--- a/webui/package-lock.json
+++ b/webui/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.31",
+  "version": "0.1.32",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@govoplan/core-webui",
-      "version": "0.1.31",
+      "version": "0.1.32",
       "dependencies": {
         "@govoplan/access-webui": "file:../../govoplan-access/webui",
         "@govoplan/addresses-webui": "file:../../govoplan-addresses/webui",
@@ -243,7 +243,7 @@
     },
     "../../govoplan-connectors/webui": {
       "name": "@govoplan/connectors-webui",
-      "version": "0.1.20",
+      "version": "0.1.21",
       "peerDependencies": {
         "@govoplan/core-webui": "^0.1.18",
         "react": ">=19.2.7 <20",
diff --git a/webui/package-lock.release.json b/webui/package-lock.release.json
index a012c17..5c5cf85 100644
--- a/webui/package-lock.release.json
+++ b/webui/package-lock.release.json
@@ -1,12 +1,12 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.31",
+  "version": "0.1.32",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@govoplan/core-webui",
-      "version": "0.1.31",
+      "version": "0.1.32",
       "dependencies": {
         "@govoplan/access-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#v0.1.19",
         "@govoplan/admin-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-admin.git#v0.1.18",
diff --git a/webui/package.json b/webui/package.json
index 9ffd02d..3d2c00a 100644
--- a/webui/package.json
+++ b/webui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.31",
+  "version": "0.1.32",
   "private": true,
   "type": "module",
   "main": "src/index.ts",
diff --git a/webui/package.release.json b/webui/package.release.json
index 87a824d..d38b42e 100644
--- a/webui/package.release.json
+++ b/webui/package.release.json
@@ -1,6 +1,6 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.31",
+  "version": "0.1.32",
   "private": true,
   "type": "module",
   "main": "src/index.ts",