Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck

CVE-2026-67344ArcadeDB before 26.7.2 Authentication Bypass via ALTER TYPE

Medium 4.3

In plain English

A medium-severity missing authorization in arcadedb from ArcadeData. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 84.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

ArcadeDB before 26.7.2 fails to enforce the UPDATE_SCHEMA database permission on the ALTER TYPE ... CUSTOM and ALTER TYPE ... BUCKETSELECTIONSTRATEGY SQL operations, which map to setCustomValue and setBucketSelectionStrategy in LocalDocumentType. An authenticated user with only read access (e.g., a read-only API token) can submit these ALTER TYPE statements via the HTTP command endpoint to mutate a type's custom schema metadata and bucket-selection strategy, bypassing the documented updateSchema permission boundary and potentially corrupting schema metadata and record routing.

Affected products (as reported)

Vendor	Product	Versions
ArcadeData	arcadedb	0 – before 26.7.2

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-8vr5-263f-x5r3) vendor-advisory
VulnCheck Advisory: ArcadeDB before 26.7.2 Authentication Bypass via ALTER TYPE third-party-advisory