EUVD-2026-82889
GHSA-34w2-f24j-55hj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable low-privileged authed user (PR:L) with no interaction; broad confidential read of indexed data (C:H); index deletion corrupts data-index consistency and defeats unique constraints (I:L); no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
ArcadeDB (Maven artifact com.arcadedb:arcadedb-engine) through 26.8.1 enforces its per-type/per-record access-control rules only in LocalBucket, keyed on file id. Query-execution paths that reach record data through LSM index files or the TimeSeries engine never invoke that permission check, so an authenticated user who is denied readRecord/deleteRecord on a type can still, with a single ordinary SQL statement, read the type's indexed key values and record IDs (e.g. SELECT key, rid FROM INDEX:Type[field]), read MAX/MIN values via the index shortcut, read and count TimeSeries samples, learn the type's record count, and delete index entries (DELETE FROM INDEX:Type[field]), which desynchronizes the index from the data and can defeat unique constraints. Index and type names needed for exploitation are discoverable because SELECT FROM schema:indexes is unfiltered. The issue affects both embedded and server deployments and all transports (HTTP, Bolt, Postgres, Gremlin) once a principal is bound. Fixed in 26.9.1.
Articles & Coverage 1
AnalysisAI
ArcadeDB deployments through 26.8.1 allow any authenticated principal - including a low-privileged user explicitly denied readRecord and deleteRecord on a given type - to bypass per-type/per-record access-control rules and read indexed key values, record IDs, MIN/MAX values, record counts and TimeSeries samples, and to delete index entries via ordinary SQL statements such as SELECT key, rid FROM INDEX:Type[field] and DELETE FROM INDEX:Type[field]. The flaw exists because ACL checks are enforced only in LocalBucket (keyed on file id) and are never invoked by query paths that reach record data through LSM index files or the TimeSeries engine, while schema discovery via SELECT FROM schema:indexes is unfiltered and exposes the index and type names needed to build an exploit. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated principal bound to the database (PR:L) - any valid low-privileged user account, including one explicitly denied readRecord/deleteRecord on the target type. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine, medium-to-high priority authorization flaw for organizations actually running ArcadeDB, but not a mass-exploitation emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patch by upgrading ArcadeDB - including the com.arcadedb:arcadedb-engine artifact - to 26.9.1 or later, which is the version that closes the ACL bypass; the fix is confirmed available from the vendor per the GitHub advisory GHSA-2c8m-q484-jv7m (https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-2c8m-q484-jv7m) and the VulnCheck advisory (https://www.vulncheck.com/advisories/arcadedb-before-26.9.1-acl-bypass-via-index-and-timeseries), with no vendor patch identified for versions at or below 26.8.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every ArcadeDB instance at or below 26.8.1 across embedded and server deployments, identify which are reachable by users who should not see all record types, restrict network access to the HTTP, Bolt, Postgres and Gremlin ports, and temporarily reduce the number of accounts holding query privileges. …
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External POC / Exploit Code
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