diff --git a/codegen.yml b/codegen.yml
index cb27a44a..bf4f875b 100644
--- a/codegen.yml
+++ b/codegen.yml
@@ -2,6 +2,9 @@ overwrite: true
 schema:
   'src/schema/**/*.ts':
     noRequire: true
+hooks:
+  afterAllFileWrite:
+    - prettier --write
 generates:
   src/types/generated/schema-types.ts:
     plugins:
diff --git a/package.json b/package.json
index db158d44..b7a0a9c8 100644
--- a/package.json
+++ b/package.json
@@ -70,6 +70,7 @@
     "knex": "^3.2.10",
     "knex-postgis": "^0.14.3",
     "lodash": "^4.17.11",
+    "lusca": "^1.7.0",
     "moment": "^2.24.0",
     "moment-timezone": "^0.5.23",
     "node-fetch": "^2.3.0",
@@ -95,6 +96,7 @@
     "@types/ioredis": "^4.0.9",
     "@types/jest": "^30",
     "@types/lodash": "^4.14.122",
+    "@types/lusca": "^1.7.5",
     "@types/node": "^20",
     "@types/validator": "^13.15.4",
     "concurrently": "^4.1.0",
diff --git a/src/admin/adminController.ts b/src/admin/adminController.ts
index 05e8c5eb..2e4e06c5 100644
--- a/src/admin/adminController.ts
+++ b/src/admin/adminController.ts
@@ -1,4 +1,5 @@
 import express from 'express'
+import lusca from 'lusca'
 import {
   DomainGroup,
   getSettings,
@@ -19,9 +20,20 @@ export const adminController = async (adminPath) => {
   const prefixedAdminPath = join(PATH_PREFIX, adminPath)
   const adminRouter = express.Router()
 
+  // Protect the state-changing admin form submissions (rendered as HTML forms
+  // and posted as application/x-www-form-urlencoded) against CSRF. lusca.csrf
+  // stores a secret in the existing session and exposes the per-session token
+  // as `res.locals._csrf`, which must be echoed back via the hidden `_csrf`
+  // field embedded in each form.
+  adminRouter.use(lusca.csrf())
+
   adminRouter.get('/', async (req, res) => {
     const currentState = await getSettings()
-    res.render('Admin', { adminPath: prefixedAdminPath, settings: currentState })
+    res.render('Admin', {
+      adminPath: prefixedAdminPath,
+      settings: currentState,
+      csrfToken: res.locals._csrf,
+    })
   })
 
   function createDomainGroupsFromInput(input: string): DomainGroup[] {
diff --git a/src/types/generated/resolver-types.ts b/src/types/generated/resolver-types.ts
index 5a5a055c..a71ab680 100644
--- a/src/types/generated/resolver-types.ts
+++ b/src/types/generated/resolver-types.ts
@@ -1117,8 +1117,8 @@ export type ResolversTypes = {
   Mutation: ResolverTypeWrapper<{}>
   Feedback: ResolverTypeWrapper<Feedback>
   Upload: ResolverTypeWrapper<Scalars['Upload']>
-  BBox: ResolverTypeWrapper<Scalars['BBox']>
   TlpType: TlpType
+  BBox: ResolverTypeWrapper<Scalars['BBox']>
 }
 
 /** Mapping between all available schema types and the resolvers parents */
@@ -1165,7 +1165,9 @@ export type ResolversParentTypes = {
   ObservedArrival: ObservedArrival
   ObservedDeparture: ObservedDeparture
   ExceptionDay: ExceptionDay
-  Journey: Omit<Journey, 'events'> & { events: ResolversParentTypes['JourneyEventType'][] }
+  Journey: Omit<Journey, 'events'> & {
+    events: ResolversParentTypes['JourneyEventType'][]
+  }
   VehiclePosition: VehiclePosition
   JourneyEventType:
     | ResolversParentTypes['JourneyEvent']
@@ -1193,8 +1195,8 @@ export type ResolversParentTypes = {
   Mutation: {}
   Feedback: Feedback
   Upload: Scalars['Upload']
-  BBox: Scalars['BBox']
   TlpType: TlpType
+  BBox: Scalars['BBox']
 }
 
 export type AlertResolvers<
diff --git a/src/views/Admin.js b/src/views/Admin.js
index 5f562028..ef2aa596 100644
--- a/src/views/Admin.js
+++ b/src/views/Admin.js
@@ -4,14 +4,14 @@ import GroupAssignment from './components/GroupAssignment'
 import AutoDomainGroups from './components/AutoDomainGroups'
 import join from 'proper-url-join'
 
-const AdminView = ({ adminPath, settings }) => {
+const AdminView = ({ adminPath, settings, csrfToken }) => {
   return (
     <>
       <h1>Transitlog server admin</h1>
       <hr />
-      <UIMessageForm adminPath={adminPath} settings={settings} />
-      <GroupAssignment adminPath={adminPath} settings={settings} />
-      <AutoDomainGroups adminPath={adminPath} settings={settings} />
+      <UIMessageForm adminPath={adminPath} settings={settings} csrfToken={csrfToken} />
+      <GroupAssignment adminPath={adminPath} settings={settings} csrfToken={csrfToken} />
+      <AutoDomainGroups adminPath={adminPath} settings={settings} csrfToken={csrfToken} />
       <hr />
       <h3>Clear cache</h3>
       <p>
@@ -19,6 +19,7 @@ const AdminView = ({ adminPath, settings }) => {
         will result in some queries taking longer due to being fetched from the DB.
       </p>
       <form method="post" action={join(adminPath, 'clear-cache')}>
+        <input type="hidden" name="_csrf" value={csrfToken} />
         <input type="submit" value="Clear cache" />
       </form>
     </>
diff --git a/src/views/components/AutoDomainGroups.js b/src/views/components/AutoDomainGroups.js
index c24a526a..7e35795e 100644
--- a/src/views/components/AutoDomainGroups.js
+++ b/src/views/components/AutoDomainGroups.js
@@ -2,13 +2,14 @@ import React from 'react'
 import join from 'proper-url-join'
 import { get } from 'lodash'
 
-const AutoDomainGroups = ({ adminPath, settings }) => {
+const AutoDomainGroups = ({ adminPath, settings, csrfToken }) => {
   const assignedGroups = get(settings, 'auto_domain_groups', [])
 
   return (
     <>
       <h3>Create groups for emails</h3>
       <form action={join(adminPath, 'set-auto-groups')} method="post">
+        <input type="hidden" name="_csrf" value={csrfToken} />
         <fieldset>
           <legend>HSL ID group creation</legend>
           <p>
diff --git a/src/views/components/GroupAssignment.js b/src/views/components/GroupAssignment.js
index 331b733b..5869e4df 100644
--- a/src/views/components/GroupAssignment.js
+++ b/src/views/components/GroupAssignment.js
@@ -2,13 +2,14 @@ import React from 'react'
 import join from 'proper-url-join'
 import { get } from 'lodash'
 
-const GroupAssignment = ({ adminPath, settings }) => {
+const GroupAssignment = ({ adminPath, settings, csrfToken }) => {
   const assignedGroups = get(settings, 'domain_groups', [])
 
   return (
     <>
       <h3>Assign email domains to groups</h3>
       <form action={join(adminPath, 'set-groups')} method="post">
+        <input type="hidden" name="_csrf" value={csrfToken} />
         <fieldset>
           <legend>HSL ID group assignment</legend>
           <p>
diff --git a/src/views/components/UIMessage.js b/src/views/components/UIMessage.js
index 26a4a6ce..069c1bff 100644
--- a/src/views/components/UIMessage.js
+++ b/src/views/components/UIMessage.js
@@ -2,13 +2,14 @@ import React from 'react'
 import join from 'proper-url-join'
 import { get } from 'lodash'
 
-const UIMessageForm = ({ settings, adminPath }) => {
+const UIMessageForm = ({ settings, adminPath, csrfToken }) => {
   const message = get(settings, 'ui_message') || { date: '', message: '' }
 
   return (
     <>
       <h3>Set UI message</h3>
       <form method="post" action={join(adminPath, 'set-ui-message')}>
+        <input type="hidden" name="_csrf" value={csrfToken} />
         <fieldset>
           <legend>UI message</legend>
           <p>Set a message that is shown in the UI.</p>
diff --git a/yarn.lock b/yarn.lock
index cd1c6178..c8ce501b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2608,9 +2608,21 @@
   integrity sha512-gIW7lQLZbue7lRSWEFql49QJJWThrTFFeIMJdp3eH4tKoxm1OvEPg02rm4wCCSHS0cL3/Fizimb35b7k8atwsQ==
 
 "@types/long@^4.0.0":
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/@types/long/-/long-4.0.2.tgz#b74129719fc8d11c01868010082d483b7545591a"
-  integrity sha512-MqTGEo5bj5t157U6fA/BiDynNkn0YknVdh48CMPkTSpFTVmvao5UQmm7uEF6xBEo7qIMAlY/JSleYaE6VOdpaA==
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/@types/long/-/long-4.0.1.tgz#459c65fa1867dafe6a8f322c4c51695663cc55e9"
+  integrity sha512-5tXH6Bx/kNGd3MgffdmP4dy2Z+G4eaXw0SE81Tq3BNadtnMR5/ySMzX4SLEzHJzSmPNn4HIdpQsBvXMUykr58w==
+
+"@types/lusca@^1.7.5":
+  version "1.7.5"
+  resolved "https://registry.yarnpkg.com/@types/lusca/-/lusca-1.7.5.tgz#6fff257dc11176bd3150afba90790e626a12cd0f"
+  integrity sha512-l49gAf8pu2iMzbKejLcz6Pqj+51H2na6BgORv1ElnE8ByPFcBdh/eZ0WNR1Va/6ZuNSZa01Hoy1DTZ3IZ+y+kA==
+  dependencies:
+    "@types/express" "*"
+
+"@types/mime@^1":
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/@types/mime/-/mime-1.3.2.tgz#93e25bf9ee75fe0fd80b594bc4feb0e862111b5a"
+  integrity sha512-YATxVxgRqNH6nHEIsvg6k2Boc1JHI9ZbH5iWFFv/MTkchz3b1ieGDa5T0a9RznNdI0KhVbdbWSN+KWWrQZRxTw==
 
 "@types/minimatch@*":
   version "6.0.0"
@@ -6947,6 +6959,20 @@ lru-cache@^5.0.0, lru-cache@^5.1.1:
   dependencies:
     yallist "^3.0.2"
 
+lru-cache@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-6.0.0.tgz#6d6fe6570ebd96aaf90fcad1dafa3b2566db3a94"
+  integrity sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==
+  dependencies:
+    yallist "^4.0.0"
+
+lusca@^1.7.0:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/lusca/-/lusca-1.7.0.tgz#a5d979f1b51776e60d41e0ca98f886f1b8b95502"
+  integrity sha512-msnrplCfY7zaqlZBDEloCIKld+RUeMZVeWzSPaGUKeRXFlruNSdKg2XxCyR+zj6BqzcXhXlRnvcvx6rAGgsvMA==
+  dependencies:
+    tsscmp "^1.0.5"
+
 make-dir@^1.0.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-1.3.0.tgz#79c1033b80515bd6d24ec9933e860ca75ee27f0c"
@@ -9307,6 +9333,11 @@ tslint@^6.1.3:
     tslib "^1.13.0"
     tsutils "^2.29.0"
 
+tsscmp@^1.0.5:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/tsscmp/-/tsscmp-1.0.6.tgz#85b99583ac3589ec4bfef825b5000aa911d605eb"
+  integrity sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA==
+
 tsutils@^2.29.0:
   version "2.29.0"
   resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-2.29.0.tgz#32b488501467acbedd4b85498673a0812aca0b99"