Can Agents Run It? · evidence — Issue 1: Supabase

google/gemini-3.1-pro-preview · d1_rls_owner · rep 3

pass
model
google/gemini-3.1-pro-preview
task
d1_rls_owner
rep
3
day
1
steps
20
tokens
88,065
est. cost
$0.528
agent time
102s
wave
s4
started
2026-07-24T04:32:00Z

The task as the agent received it

You have operator access to a hosted Supabase project. Credentials are in environment variables: SUPABASE_URL, SUPABASE_PROJECT_REF, SUPABASE_ANON_KEY, SUPABASE_SERVICE_ROLE_KEY, SUPABASE_DB_URL, SUPABASE_DB_PASSWORD. The project has a public.notes table (id, user_id references auth.users, title, body) that currently exposes every user's notes to anyone through the REST API. Lock it down to owner-only access: - an authenticated user must be able to read, insert, update and delete ONLY rows where user_id equals their own auth user id; - a user must NOT be able to insert a row with someone else's user_id; - anonymous (anon key only) requests must see no rows; - legitimate owners must keep working through the REST API — do not break their access path. Two existing users for your own testing: alice@cari.dev / Passw0rd-alice-42 and bob@cari.dev / Passw0rd-bob-58. Each currently owns 2 notes. Do not modify the data.

What it ran — 20 commands

#1exit 127
psql --version || sudo apt-get update && sudo apt-get install -y postgresql-client
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)

bash: line 1: sudo: command not found
#2exit 0
psql --version
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)
#3exit 0
echo $SUPABASE_DB_URL
<redacted:SUPABASE_DB_URL>
#4exit 0
psql $SUPABASE_DB_URL -c "\d public.notes"
                            Table "public.notes"
 Column  |  Type  | Collation | Nullable |             Default              
---------+--------+-----------+----------+----------------------------------
 id      | bigint |           | not null | generated by default as identity
 user_id | uuid   |           | not null | 
 title   | text   |           | not null | 
 body    | text   |           | not null | ''::text
Indexes:
    "notes_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "notes_user_id_fkey" FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE
#5exit 0
cat << 'EOF' > setup.sql
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;
CREATE POLICY "notes_owner_access" ON public.notes FOR ALL TO authenticated USING (auth.uid() = user_id) WITH CHECK (auth.uid() = user_id);
EOF
psql $SUPABASE_DB_URL -f setup.sql
ALTER TABLE
CREATE POLICY
#6exit 0
npm init -y && npm install @supabase/supabase-js
Wrote to /work/package.json:

{
  "name": "work",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}



added 9 packages, and audited 10 packages in 608ms

found 0 vulnerabilities

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/supabase-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/auth-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/functions-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/postgrest-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/realtime-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/storage-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'iceberg-js@0.8.1',
npm WARN EBADENGINE   required: { node: '>=20.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
#7exit 1
cat << 'EOF' > test.js
const { createClient } = require('@supabase/supabase-js')

const supabase = createClient(process.env.SUPABASE_URL, process.env.SUPABASE_ANON_KEY)

async function runTest() {
  const anonRes = await supabase.from('notes').select('*')
  console.log('Anon data length:', anonRes.data?.length)
  
  const { data: authData, error: authErr } = await supabase.auth.signInWithPassword({
    email: 'alice@cari.dev',
    password: 'Passw0rd-alice-42'
  })
  
  if (authErr) {
    console.error('Alice auth error:', authErr)
    return
  }
  
  const aliceId = authData.user.id
  
  const aliceNotesRes = await supabase.from('notes').select('*')
  console.log('Alice notes:', aliceNotesRes.data?.length)
  
  const { data: bobAuth, error: bobErr } = await supabase.auth.signInWithPassword({
    email: 'bob@cari.dev',
    password: 'Passw0rd-bob-58'
  })
  
  const bobId = bobAuth.user.id
  
  const bobNotesRes = await supabase.from('notes').select('*')
  console.log('Bob notes:', bobNotesRes.data?.length)

  // Bob trying to read alice's note?
  const bobReadAlice = await supabase.from('notes').select('*').eq('user_id', aliceId)
  console.log('Bob reads Alice notes:', bobReadAlice.data?.length)

  // Bob trying to insert note for alice
  const insertRes = await supabase.from('notes').insert({
    title: 'Hacked by Bob',
    user_id: aliceId,
    body: 'haha'
  })
  
  console.log('Bob insert Alice note error:', insertRes.error?.message)
}

runTest()
EOF
node test.js
⚠️  Node.js 20 and below are deprecated and will no longer be supported in future versions of @supabase/supabase-js. Please upgrade to Node.js 22 or later. For more information, visit: https://github.com/orgs/supabase/discussions/45715
/work/node_modules/@supabase/realtime-js/dist/main/lib/websocket-factory.js:86
        throw new Error(errorMessage);
        ^

Error: Node.js detected but native WebSocket not found.

Suggested solution: Ensure you are running Node.js 22+ or provide a WebSocket implementation via the transport option.
    at WebSocketFactory.getWebSocketConstructor (/work/node_modules/@supabase/realtime-js/dist/main/lib/websocket-factory.js:86:15)
    at RealtimeClient._initializeOptions (/work/node_modules/@supabase/realtime-js/dist/main/RealtimeClient.js:630:164)
    at new RealtimeClient (/work/node_modules/@supabase/realtime-js/dist/main/RealtimeClient.js:184:43)
    at SupabaseClient._initRealtimeClient (/work/node_modules/@supabase/supabase-js/dist/index.cjs:1468:10)
    at new SupabaseClient (/work/node_modules/@supabase/supabase-js/dist/index.cjs:1293:24)
    at createClient (/work/node_modules/@supabase/supabase-js/dist/index.cjs:1501:9)
    at Object.<anonymous> (/work/test.js:3:18)
    at Module._compile (node:internal/modules/cjs/loader:1364:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
    at Module.load (node:internal/modules/cjs/loader:1203:32)

Node.js v18.20.4
#8exit 0
psql $SUPABASE_DB_URL -c "\d public.notes"
                            Table "public.notes"
 Column  |  Type  | Collation | Nullable |             Default              
---------+--------+-----------+----------+----------------------------------
 id      | bigint |           | not null | generated by default as identity
 user_id | uuid   |           | not null | 
 title   | text   |           | not null | 
 body    | text   |           | not null | ''::text
Indexes:
    "notes_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "notes_user_id_fkey" FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE
Policies:
    POLICY "notes_owner_access"
      TO authenticated
      USING ((auth.uid() = user_id))
      WITH CHECK ((auth.uid() = user_id))
#9exit 0
curl -sS -X GET "$SUPABASE_URL/rest/v1/notes" -H "apikey: $SUPABASE_ANON_KEY"
[]
#10exit 1
cat << 'EOF' > test2.js
const { createClient } = require('@supabase/supabase-js')
const ws = require('ws')

const supabase = createClient(process.env.SUPABASE_URL, process.env.SUPABASE_ANON_KEY)

async function runTest() {
  const { data, error } = await supabase.auth.signInWithPassword({
    email: 'alice@cari.dev',
    password: 'Passw0rd-alice-42'
  })
  
  if (error) {
    console.error('Alice auth error:', error)
    return
  }
}
runTest()
EOF
npm install ws && node test2.js
added 1 package, and audited 11 packages in 391ms

found 0 vulnerabilities

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/auth-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/functions-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/postgrest-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/realtime-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/storage-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@supabase/supabase-js@2.110.8',
npm WARN EBADENGINE   required: { node: '>=22.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'iceberg-js@0.8.1',
npm WARN EBADENGINE   required: { node: '>=20.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.20.4', npm: '9.2.0' }
npm WARN EBADENGINE }
⚠️  Node.js 20 and below are deprecated and will no longer be supported in future versions of @supabase/supabase-js. Please upgrade to Node.js 22 or later. For more information, visit: https://github.com/orgs/supabase/discussions/45715
/work/node_modules/@supabase/realtime-js/dist/main/lib/websocket-factory.js:86
        throw new Error(errorMessage);
        ^

Error: Node.js detected but native WebSocket not found.

Suggested solution: Ensure you are running Node.js 22+ or provide a WebSocket implementation via the transport option.
    at WebSocketFactory.getWebSocketConstructor (/work/node_modules/@supabase/realtime-js/dist/main/lib/websocket-factory.js:86:15)
    at RealtimeClient._initializeOptions (/work/node_modules/@supabase/realtime-js/dist/main/RealtimeClient.js:630:164)
    at new RealtimeClient (/work/node_modules/@supabase/realtime-js/dist/main/RealtimeClient.js:184:43)
    at SupabaseClient._initRealtimeClient (/work/node_modules/@supabase/supabase-js/dist/index.cjs:1468:10)
    at new SupabaseClient (/work/node_modules/@supabase/supabase-js/dist/index.cjs:1293:24)
    at createClient (/work/node_modules/@supabase/supabase-js/dist/index.cjs:1501:9)
    at Object.<anonymous> (/work/test2.js:4:18)
    at Module._compile (node:internal/modules/cjs/loader:1364:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
    at Module.load (node:internal/modules/cjs/loader:1203:32)

Node.js v18.20.4
#11exit 0
psql $SUPABASE_DB_URL -c "select * from pg_policies where tablename = 'notes'"
 schemaname | tablename |     policyname     | permissive |      roles      | cmd |          qual          |       with_check       
------------+-----------+--------------------+------------+-----------------+-----+------------------------+------------------------
 public     | notes     | notes_owner_access | PERMISSIVE | {authenticated} | ALL | (auth.uid() = user_id) | (auth.uid() = user_id)
(1 row)
#12exit 0
curl -sS -X POST "$SUPABASE_URL/auth/v1/token?grant_type=password" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "alice@cari.dev", "password": "Passw0rd-alice-42"}'
{"access_token":"<jwt:authenticated>","token_type":"bearer","expires_in":3600,"expires_at":1784871191,"refresh_token":"6w4rb3z4gohp","user":{"id":"e173025c-ca17-4cea-a5a4-2dee35ca3bc7","aud":"authenticated","role":"authenticated","email":"alice@cari.dev","email_confirmed_at":"2026-07-24T04:32:11.035047Z","phone":"","confirmed_at":"2026-07-24T04:32:11.035047Z","last_sign_in_at":"2026-07-24T04:33:11.892696763Z","app_metadata":{"provider":"email","providers":["email"]},"user_metadata":{"email_verified":true},"identities":[{"identity_id":"7bfc9f08-d7a0-4da7-8a52-8b030b4924b1","id":"e173025c-ca17-4cea-a5a4-2dee35ca3bc7","user_id":"e173025c-ca17-4cea-a5a4-2dee35ca3bc7","identity_data":{"email":"alice@cari.dev","email_verified":false,"phone_verified":false,"sub":"e173025c-ca17-4cea-a5a4-2dee35ca3bc7"},"provider":"email","last_sign_in_at":"2026-07-24T04:32:11.033106Z","created_at":"2026-07-24T04:32:11.033155Z","updated_at":"2026-07-24T04:32:11.033155Z","email":"alice@cari.dev"}],"created_at":"2026-07-24T04:32:11.031929Z","updated_at":"2026-07-24T04:33:11.895734Z","is_anonymous":false},"weak_password":null}
#13exit 0
curl -sS -X GET "$SUPABASE_URL/rest/v1/notes" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Authorization: Bearer <jwt:authenticated>"
[{"id":1,"user_id":"e173025c-ca17-4cea-a5a4-2dee35ca3bc7","title":"Groceries","body":"milk, eggs, coffee"}, 
 {"id":2,"user_id":"e173025c-ca17-4cea-a5a4-2dee35ca3bc7","title":"Call plumber","body":"kitchen sink leaks"}]
#14exit 0
curl -sS -X POST "$SUPABASE_URL/auth/v1/token?grant_type=password" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "bob@cari.dev", "password": "Passw0rd-bob-58"}'
{"access_token":"<jwt:authenticated>","token_type":"bearer","expires_in":3600,"expires_at":1784871203,"refresh_token":"cg54j5jdl27c","user":{"id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","aud":"authenticated","role":"authenticated","email":"bob@cari.dev","email_confirmed_at":"2026-07-24T04:32:11.580608Z","phone":"","confirmed_at":"2026-07-24T04:32:11.580608Z","last_sign_in_at":"2026-07-24T04:33:23.871453369Z","app_metadata":{"provider":"email","providers":["email"]},"user_metadata":{"email_verified":true},"identities":[{"identity_id":"2b6f243e-acf1-4392-9522-7038088f15a9","id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","user_id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","identity_data":{"email":"bob@cari.dev","email_verified":false,"phone_verified":false,"sub":"ed206b24-8937-4220-9d96-966d9aa8e1f0"},"provider":"email","last_sign_in_at":"2026-07-24T04:32:11.579127Z","created_at":"2026-07-24T04:32:11.579182Z","updated_at":"2026-07-24T04:32:11.579182Z","email":"bob@cari.dev"}],"created_at":"2026-07-24T04:32:11.578105Z","updated_at":"2026-07-24T04:33:23.873477Z","is_anonymous":false},"weak_password":null}
#15exit 0
curl -sS -X GET "$SUPABASE_URL/rest/v1/notes" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Authorization: Bearer <jwt:authenticated>"
[{"id":3,"user_id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","title":"Gym plan","body":"push pull legs"}, 
 {"id":4,"user_id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","title":"Trip ideas","body":"mountains in october"}]
#16exit 0
curl -sS -X POST "$SUPABASE_URL/rest/v1/notes" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Authorization: Bearer <jwt:authenticated>" \
-H "Content-Type: application/json" \
-H "Prefer: return=representation" \
-d '{"title": "Hacked", "body": "haha", "user_id": "e173025c-ca17-4cea-a5a4-2dee35ca3bc7"}'
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
#17exit 0
cat << 'EOF' > fix_policy.sql
ALTER TABLE public.notes ENABLE ROW LEVEL SECURITY;
DROP POLICY IF EXISTS "notes_owner_access" ON public.notes;

-- Policy for SELECT
CREATE POLICY "notes_select_policy" ON public.notes
FOR SELECT TO authenticated
USING (auth.uid() = user_id);

-- Policy for INSERT
CREATE POLICY "notes_insert_policy" ON public.notes
FOR INSERT TO authenticated
WITH CHECK (auth.uid() = user_id);

-- Policy for UPDATE
CREATE POLICY "notes_update_policy" ON public.notes
FOR UPDATE TO authenticated
USING (auth.uid() = user_id)
WITH CHECK (auth.uid() = user_id);

-- Policy for DELETE
CREATE POLICY "notes_delete_policy" ON public.notes
FOR DELETE TO authenticated
USING (auth.uid() = user_id);
EOF
psql $SUPABASE_DB_URL -f fix_policy.sql
ALTER TABLE
DROP POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
CREATE POLICY
#18exit 0
curl -sS -X POST "$SUPABASE_URL/rest/v1/notes" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Authorization: Bearer <jwt:authenticated>" \
-H "Content-Type: application/json" \
-H "Prefer: return=representation" \
-d '{"title": "Hacked", "body": "haha", "user_id": "e173025c-ca17-4cea-a5a4-2dee35ca3bc7"}'
{"code":"42501","details":null,"hint":null,"message":"new row violates row-level security policy for table \"notes\""}
#19exit 0
curl -sS -X GET "$SUPABASE_URL/rest/v1/notes" -H "apikey: $SUPABASE_ANON_KEY"
[]
#20exit 0
curl -sS -X GET "$SUPABASE_URL/rest/v1/notes" \
-H "apikey: $SUPABASE_ANON_KEY" \
-H "Authorization: Bearer <jwt:authenticated>"
[{"id":3,"user_id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","title":"Gym plan","body":"push pull legs"}, 
 {"id":4,"user_id":"ed206b24-8937-4220-9d96-966d9aa8e1f0","title":"Trip ideas","body":"mountains in october"}]

How it was graded

A shell script executed against the live project and asserted on the state the agent left behind. No model judged another model.

exit 0 OK

Check it yourself

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