Scope the organization export to what the caller may actually read

A security review of this branch (finding F1) pointed out that the
'Access Import/Export' permission, which this branch added and which
opens GET /organizations/<id>/export via AccessImportExportHeaders,
decided *whether* a member may export but not *what* they get: the
handler always dumped Cipher::find_by_org(), and CipherSyncType::
Organization deliberately skips the per-cipher access restrictions.

A confirmed Custom member holding only accessImportExport - assigned to
no collection at all - therefore received every cipher of the
organization, including collections they were explicitly excluded from.
Every confirmed member holds the organization key, so the exported blobs
are decryptable by the caller.

The export is now built from the caller's own assignments unless they
already reach every collection anyway (Admin/Owner, or a Custom member
with 'Edit any collection'), which is what Bitwarden's export controller
does. Group-based access is covered: both scoped queries honour group
assignments and group access_all.

* new helper may_export_entire_organization() names the decision and
  keeps it unit-testable
* get_org_details_impl() split into ciphers_to_org_json() so the export
  can serialize an already-authorized cipher list; the serializer's doc
  comment states that requirement
* new regression test access_import_export_alone_does_not_widen_the_export

Verified: cargo check, cargo clippy --features sqlite (clean),
cargo test --features sqlite (48 passed), cargo fmt --all -- --check.

src/api/core/organizations.rs

@@ -1077,7 +1077,18 @@ async fn get_org_details_impl(
     user_id: &UserId,
     conn: &DbConn,
 ) -> Result<Value, crate::Error> {
-    let ciphers = Cipher::find_by_org(org_id, conn).await;
+    ciphers_to_org_json(Cipher::find_by_org(org_id, conn).await, host, user_id, conn).await
+}
+
+// Serialize an already-authorized set of organization ciphers. The caller decides which ciphers go
+// in: `CipherSyncType::Organization` skips the per-cipher access restrictions, so this must never be
+// handed a cipher the user is not allowed to see.
+async fn ciphers_to_org_json(
+    ciphers: Vec<Cipher>,
+    host: &str,
+    user_id: &UserId,
+    conn: &DbConn,
+) -> Result<Value, crate::Error> {
     let cipher_sync_data = CipherSyncData::new(user_id, CipherSyncType::Organization, conn).await;
 
     let mut ciphers_json = Vec::with_capacity(ciphers.len());
@@ -3218,6 +3229,17 @@ async fn caller_may_grant_collection_manage(caller: &Membership, col_id: &Collec
     }
 }
 
+/// Whether `caller` may export the *entire* organization instead of only their own assignments.
+///
+/// Security (audit F1): the `AccessImportExportHeaders` guard on `get_org_export` decides whether a
+/// member may export at all; it must not decide *what* they get. Only members who already reach
+/// every collection — Admins/Owners, and Custom members holding `edit_any_collection` — may receive
+/// the full organization dump. For anyone else the export is built from their own assigned
+/// collections/ciphers, so 'Access Import/Export' can never turn into a full vault read.
+fn may_export_entire_organization(caller: &Membership) -> bool {
+    caller.has_full_access()
+}
+
 /// Pure, collection-independent part of `caller_may_grant_collection_manage`.
 ///
 /// `Some(true)`  -> the caller may grant `manage` on *any* collection (Admin/Owner, or a Custom
@@ -3847,8 +3869,9 @@ async fn put_reset_password_enrollment(
 // NOTE: It seems clients can't handle uppercase-first keys!!
 //       We need to convert all keys so they have the first character to be a lowercase.
 //       Else the export will be just an empty JSON file.
-// We currently only support exports by members of the Admin or Owner status.
-// Vaultwarden does not yet support exporting only managed collections!
+// Members with full access to the organization (Admin/Owner, or a Custom member with
+// 'Edit any collection') export the whole organization; everyone else exports only what they can
+// actually reach, like Bitwarden's export controller does.
 // https://github.com/bitwarden/server/blob/9ebe16587175b1c0e9208f84397bb75d0d595510/src/Api/Tools/Controllers/OrganizationExportController.cs#L52
 #[get("/organizations/<org_id>/export")]
 async fn get_org_export(org_id: OrganizationId, headers: AccessImportExportHeaders, conn: DbConn) -> JsonResult {
@@ -3856,9 +3879,24 @@ async fn get_org_export(org_id: OrganizationId, headers: AccessImportExportHeade
         err!("Organization not found", "Organization id's do not match");
     }
 
+    // Security (audit F1): 'Access Import/Export' decides *whether* a member may export, it must not
+    // widen *what* they may read. Without this scoping a Custom member holding only this permission
+    // — assigned to no collection at all — would receive every cipher in the organization, because
+    // the organization sync type deliberately skips the per-cipher access restrictions.
+    let (collections, ciphers) = if may_export_entire_organization(&headers.membership) {
+        (Collection::find_by_organization(&org_id, &conn).await, Cipher::find_by_org(&org_id, &conn).await)
+    } else {
+        (
+            Collection::find_by_organization_and_user_uuid(&org_id, &headers.user.uuid, &conn).await,
+            filter_ciphers_for_organization(Cipher::find_by_user_visible(&headers.user.uuid, &conn).await, &org_id),
+        )
+    };
+
+    let collections_json: Value = collections.iter().map(Collection::to_json).collect();
+
     Ok(Json(json!({
-        "collections": convert_json_key_lcase_first(get_org_collections_impl(&org_id, &conn).await),
-        "ciphers": convert_json_key_lcase_first(get_org_details_impl(&org_id, &headers.host, &headers.user.uuid, &conn).await?),
+        "collections": convert_json_key_lcase_first(collections_json),
+        "ciphers": convert_json_key_lcase_first(ciphers_to_org_json(ciphers, &headers.host, &headers.user.uuid, &conn).await?),
     })))
 }
 
@@ -3927,7 +3965,7 @@ mod tests {
 
     use super::{
         CustomRolePermissions, caller_manage_grant_role_check, filter_ciphers_for_organization,
-        may_change_group_membership, may_change_member_type,
+        may_change_group_membership, may_change_member_type, may_export_entire_organization,
     };
     use crate::db::models::{Cipher, Membership, MembershipStatus, MembershipType, OrganizationId};
 
@@ -3971,6 +4009,32 @@ mod tests {
         assert_eq!(caller_manage_grant_role_check(&unconfirmed), Some(false));
     }
 
+    #[test]
+    fn access_import_export_alone_does_not_widen_the_export() {
+        // REGRESSION (audit F1): 'Access Import/Export' opens the export endpoint, but a Custom
+        // member holding only that permission reaches no collection of their own, so the export
+        // must be built from their assignments — never from the whole organization.
+        let mut import_export_only = confirmed_member(MembershipType::Custom);
+        import_export_only.access_import_export = true;
+        assert!(!may_export_entire_organization(&import_export_only));
+
+        // Custom members who already reach every collection keep the full dump.
+        let mut edit_any = confirmed_member(MembershipType::Custom);
+        edit_any.edit_any_collection = true;
+        edit_any.access_import_export = true;
+        assert!(may_export_entire_organization(&edit_any));
+
+        // Admins and Owners are unaffected.
+        assert!(may_export_entire_organization(&confirmed_member(MembershipType::Admin)));
+        assert!(may_export_entire_organization(&confirmed_member(MembershipType::Owner)));
+
+        // An unconfirmed membership never qualifies, whatever its flags say.
+        let mut unconfirmed = confirmed_member(MembershipType::Custom);
+        unconfirmed.edit_any_collection = true;
+        unconfirmed.status = MembershipStatus::Accepted as i32;
+        assert!(!may_export_entire_organization(&unconfirmed));
+    }
+
     #[test]
     fn assigned_cipher_response_is_scoped_to_requested_organization() {
         let requested_org: OrganizationId = "requested-org".to_owned().into();