fkie_cve-2026-54076

ArcadeDB is a Multi-Model DBMS. Prior to 26.6.1, the fix for CVE-2026-44221 added an UPDATE_SCHEMA authorization check only to LocalDocumentType.createProperty, while the remaining public schema mutators in engine/src/main/java/com/arcadedb/schema/LocalDocumentType.java and engine/src/main/java/com/arcadedb/schema/LocalProperty.java remained unchecked. An authenticated identity, including a read-only API token without UPDATE_SCHEMA permission, can use DROP PROPERTY, ALTER TYPE, or ALTER PROPERTY through the database command/query HTTP endpoints to rename types, change inheritance, alter aliases or buckets, drop properties, and change property constraints. The issue does not directly disclose or write record data, but unauthorized schema mutation can corrupt the meaning of stored records and breach the documented permission model. This issue is fixed in version 26.6.1.

GHSA-vg6x-6pg9-6qwg — ArcadeDB: Read-only users can mutate database schema (incomplete fix of CVE-2026-44221)

Affected: Maven: com.arcadedb:arcadedb-engine

### Impact

The fix for CVE-2026-44221 (GHSA-fxc7-fm93-6q77) added an `UPDATE_SCHEMA` authorization check to a single schema-mutating method (`LocalDocumentType.createProperty`). The remaining public schema mutators were left unchecked, so an authenticated identity (including a **read-only API token**) that lacks the `UPDATE_SCHEMA` permission could still mutate the database schema on its own database:

- `DROP PROPERTY <type>.<property>` - `ALTER TYPE <name> SUPERTYPE +<other>` / `-<other>` (change the inheritance hierarchy) - `ALTER TYPE <name> NAME <newName>` (rename a type) - type alias and bucket changes - `ALTER PROPERTY <type>.<property> ...` (MANDATORY, READONLY, NOTNULL, MIN, MAX, REGEXP, DEFAULT, OF, CUSTOM) — the `LocalProperty` setters had no check at all

This does not directly disclose or write record data, but it corrupts the meaning of every stored record and breaches the documented permission model, which advertises `UPDATE_SCHEMA` as the gating right for schema mutation.

### Affected component

Engine schema layer: `engine/src/main/java/com/arcadedb/schema/LocalDocumentType.java` and `engine/src/main/java/com/arcadedb/schema/LocalProperty.java`, reachable via the SQL `DROP PROPERTY`, `ALTER TYPE`, and `ALTER PROPERTY` statements over the database command/query HTTP endpoints.

### Patches

Every public schema-mutating method on `LocalDocumentType` and `LocalProperty` now enforces `checkPermissionsOnDatabase(UPDATE_SCHEMA)` via a shared helper. The check is…

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fkie_cve-2026-54076

GHSA-vg6x-6pg9-6qwg — ArcadeDB: Read-only users can mutate database schema (incomplete fix of CVE-2026-44221)