Is CVE-2026-15827 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-15827 being exploited in the wild.

How severe is CVE-2026-15827?

Medium severity, with a CVSS score of 5.3, published 23 July 2026.

Is there a fix for CVE-2026-15827?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-15827 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-15827?

Check whether you run Ataurr GutenKit at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-15827: ataurr GutenKit Blocks missing authorization in Mailchimp API endpoints

CVE-2026-15827 · Severity: medium · CVSS 5.3 · Published 2026-07-23

The GutenKit Blocks plugin for WordPress, which provides design tools for the Gutenberg editor, contains a security flaw that allows unauthorized access to Mailchimp integration data. An attacker can remotely view private information about your Mailchimp mailing lists, including subscriber counts and interest categories, without needing to log in. This could lead to the exposure of sensitive marketing configuration and audience metadata.

Technologies: Ataurr GutenKit. Vendors: Ataurr.

Quick answers

Is CVE-2026-15827 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-15827 being exploited in the wild.
How severe is CVE-2026-15827?: Medium severity, with a CVSS score of 5.3, published 23 July 2026.
Which products and versions are affected?: Ataurr GutenKit <= 2.4.12.
Is there a fix for CVE-2026-15827?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-15827 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-15827?: Check whether you run Ataurr GutenKit at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The GutenKit Blocks plugin for WordPress is vulnerable to a missing authorization check (CWE-862) within its REST API implementation. Specifically, the /wp-json/gutenkit/v1/mailchimp/get/lists and /wp-json/gutenkit/v1/mailchimp/get/interests endpoints are registered with 'permission_callback' set to '__return_true'. This configuration allows any unauthenticated user to trigger the callbacks, which retrieve the site's stored Mailchimp API key and proxy sensitive metadata—including audience lists, merge fields, and subscriber counts—back to the requester. The vulnerability affects all versions up to and including 2.4.12.

Affected products

ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor <= 2.4.12

Timeline

2026-07-23: disclosed: Initial disclosure by Wordfence and NVD publication.

References

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