Auth bypass in Arcadedata Arcadedb
CVE-2026-75850
ArcadeDB before 26.8.1 fails to bind the authenticated principal (setCurrentUser) on its batch and time-series HTTP handlers. Because no principal is bound on the worker thread, the engine's fine-grained per-type ACL layer (LocalBucket.checkPermissionsOnFile) does not execute for these handlers. In deployments that use per-type or per-group ACLs, a user with database access but only limited per-type permissions can read from and write to types they are not authorized to access by submitting requests to the batch/time-series endpoints. Deployments that rely solely on database-level access control are not affected.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/ArcadeData/arcadedb/security/advisories/GHSA-c23x-pqcj-7hfm (vendor-advisory)
- www.vulncheck.com/advisories/arcadedb-before-per-type-acl-bypass-via-batch-hand… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-75850?
- CVE-2026-75850 is a medium-severity vulnerability in Arcadedata Arcadedb, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-08-18.
- How severe is CVE-2026-75850?
- Medium severity. CVSS v3 base score is 4.2 out of 10.