CVE-2026-54076
HIGHCVE-2026-54076 is a high-severity (CVSS 8.1) vulnerability in com.arcadedb:arcadedb-engine. O3 Security confirms whether CVE-2026-54076 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
ArcadeDB: Read-only users can mutate database schema (incomplete fix of CVE-2026-44221)
Real-World Exposure
com.arcadedb:arcadedb-engineReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
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) — theLocalPropertysetters 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 a no-op in embedded mode and in system contexts with no bound user (schema load at startup, HA replication apply), so internal paths and administrators are unaffected.
Workarounds
Grant write access only to trusted users and API tokens; treat all schema DDL as administrator-only at the application layer until upgraded.
Resources
Incomplete-fix sibling of CVE-2026-44221 / GHSA-fxc7-fm93-6q77.
Credit
Reported by Kai Aizen (SnailSploit).
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.arcadedb:arcadedb-engine | all versions | 26.6.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.arcadedb:arcadedb-engine. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update com.arcadedb:arcadedb-engine to 26.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-54076 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2026-54076 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2026-54076. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-54076 in your dependencies?
O3 detects CVE-2026-54076 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.