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ArcadeDB EUVDEUVD-2026-51861

| CVE-2026-67342 CRITICAL
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-08-01 VulnCheck GHSA-gj8q-6wmr-v9mq
Grafana Authentication Bypass Arcadedb
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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
vuln.today AI
9.8 CRITICAL

Network-reachable HTTP endpoints with low complexity and a fail-open authorization check (null-user early-return) justify PR:N; full cross-database read, write and data-destruction give C:H/I:H/A:H with no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Source Code Evidence Fetched
Aug 01, 2026 - 13:07 vuln.today
Analysis Generated
Aug 01, 2026 - 13:07 vuln.today
Patch available
Aug 01, 2026 - 13:01 EUVD
CVE Published
Aug 01, 2026 - 12:22 cve.org
CRITICAL 9.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 11 maven packages depend on com.arcadedb:arcadedb-server (11 direct, 0 indirect)

Ecosystem-wide dependent count for version 26.7.2.

DescriptionCVE.org

ArcadeDB versions before 26.7.2 contain an authorization bypass vulnerability in HTTP handlers for time series, batch, Prometheus, and Grafana endpoints that fail to validate database access permissions. Attackers can access and modify databases they are not authorized to use by directly calling affected endpoints with arbitrary database parameters.

Articles & Coverage 1

News Critical IDOR Authorization Bypass in Grafana/ArcadeDB - CVE-2026-67342 Aug 01, 2026

AnalysisAI

Cross-database authorization bypass (IDOR) in ArcadeDB before 26.7.2 lets attackers read and write any database on the server by supplying an arbitrary {database} parameter to the time series (/ts/*), batch, Prometheus, and Grafana HTTP handlers. Roughly 14 endpoints resolve the target database and call getDatabase(...) without invoking canAccessToDatabase(...), so a caller scoped to one database (or, per the code, potentially an anonymous request) gains full read/write over databases they were never granted. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed ArcadeDB HTTP API
Delivery
Call /api/v1/batch/{db} or /ts/{db} with unauthorized database name
Exploit
Handler skips canAccessToDatabase gate
Execution
Read and write the target database (200 OK)
Impact
Exfiltrate or corrupt cross-database data
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Vulnerability AssessmentAI

Exploitation Exploitation requires network reachability to the ArcadeDB server HTTP API and use of one of the specific affected endpoint families - the time series routes (/api/v1/ts/{database}/write, /query, /prom/api/v1/query, latest), the batch route (/api/v1/batch/{database}), the Prometheus read/write and PromQL routes, or the Grafana query/health/metadata routes - with an arbitrary {database} path parameter naming a database the caller should not access. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All static signals point to high priority: the vendor CVSS 4.0 vector is AV:N/AC:L/AT:N/PR:N/UI:N with VC:H/VI:H/VA:H (network, low complexity, no privileges, no user interaction, full confidentiality/integrity/availability impact on the vulnerable system), scoring 9.3. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach the ArcadeDB HTTP API (a low-privilege user authorized only for database 'a', or possibly an unauthenticated caller) sends POST /api/v1/batch/b, POST /api/v1/ts/b/write, GET /api/v1/ts/b/prom/api/v1/query, or POST /api/v1/ts/b/query targeting database 'b'. Because these handlers skip the canAccessToDatabase check, they return 200 OK and grant full read and write to database 'b'. …
Remediation Upgrade to ArcadeDB 26.7.2, the fixed release identified in the GHSA advisory and EUVD (Vendor-released patch: 26.7.2); follow GHSA-x8mg-6r4p-87pf (https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-x8mg-6r4p-87pf). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all ArcadeDB instances in production and development environments and document their current versions. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-51861 vulnerability details – vuln.today
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