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

> A read-only user can escalate privileges to read arbitrary host files via JavaScript injection in the command API.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-48qw-824m-86pr

## What is CVE-2026-65831?

CVE-2026-65831 is a high-severity vulnerability in ArcadeData arcadedb, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-863 (Incorrect Authorization), CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-65831?

2 open source packages ship an affected version, including com.arcadedb:arcadedb-server.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.arcadedb:arcadedb-server` | Maven | All versions | 26.7.1 |
| `com.arcadedb:arcadedb-server` | Maven | All versions | 26.7.1 |

## How do I fix CVE-2026-65831?

Upgrade com.arcadedb:arcadedb-server to 26.7.1 or later.

## Is CVE-2026-65831 being exploited?

There is no known exploitation of CVE-2026-65831 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-65831 and fix it if it is affected.

What it is: CVE-2026-65831 is a high-severity vulnerability in ArcadeData arcadedb, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-65831 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.arcadedb:arcadedb-server (Maven): affected all versions; fixed in 26.7.1
- com.arcadedb:arcadedb-server (Maven): affected all versions; fixed in 26.7.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-65831/ (Markdown: https://insights.sbomify.com/CVE-2026-65831/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65831
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65831
- OSV: https://osv.dev/vulnerability/CVE-2026-65831

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-65831/
Summaries are generated and may contain mistakes; the official description above is the record.