Is CVE-2023-40027 actively exploited?

No active exploitation of CVE-2023-40027 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-40027 be exploited remotely?

Yes. CVE-2023-40027 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-40027?

CVE-2023-40027 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2023-40027

CWE-862Published: August 15, 2023· Updated: Jun 17, 2026

5.3

CVSS v3.1

Official Description

Keystone is an open source headless CMS for Node.js — built with GraphQL and React. When `ui.isAccessAllowed` is set as `undefined`, the `adminMeta` GraphQL query is publicly accessible (no session required). This is different to the behaviour of the default AdminUI middleware, which by default will only be publicly accessible (no session required) if a `session` strategy is not defined. This vulnerability does not affect developers using the `@keystone-6/auth` package, or any users that have written their own `ui.isAccessAllowed` (that is to say, `isAccessAllowed` is not `undefined`). This vulnerability does affect users who believed that their `session` strategy will, by default, enforce that `adminMeta` is inaccessible by the public in accordance with that strategy; akin to the behaviour of the AdminUI middleware. This vulnerability has been patched in `@keystone-6/core` version `5.5.1`. Users are advised to upgrade. Users unable to upgrade may opt to write their own `isAccessAllowed` functionality to work-around this vulnerability.

NVD Source

Technical Analysis

CVE-2023-40027 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.