Is CVE-2026-56063 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-56063 being exploited in the wild.

How severe is CVE-2026-56063?

High severity, with a CVSS score of 8.3, published 26 June 2026.

Which products and versions are affected?

bPlugins MailChimp Block <= 1.1.15.

Is there a fix for CVE-2026-56063?

A patch was published on 2026-06-26: NVD publication and patch availability confirmed for version 1.1.16 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-56063 attacked?

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

Am I affected by CVE-2026-56063?

Check whether you run bPlugins MailChimp Block 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-2026-56063: bPlugins MailChimp Block broken access control

Q: Is there a fix for CVE-2026-56063?

A patch was published on 2026-06-26: NVD publication and patch availability confirmed for version 1.1.16 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-56063 attacked?

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

Q: Am I affected by CVE-2026-56063?

Check whether you run bPlugins MailChimp Block 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-2026-56063 · Severity: high · CVSS 8.3 · Published 2026-06-26

The MailChimp Block plugin for WordPress, which allows site owners to integrate MailChimp signup forms, contains a security flaw that permits unauthorized access to certain functions. An attacker could exploit this to perform actions on the website that should be restricted to administrators. This could lead to unauthorized changes to site content or configuration, potentially impacting the site's integrity and operations.

Vendors: bPlugins.

Quick answers

Is CVE-2026-56063 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-56063 being exploited in the wild.
How severe is CVE-2026-56063?: High severity, with a CVSS score of 8.3, published 26 June 2026.
Which products and versions are affected?: bPlugins MailChimp Block <= 1.1.15.
Is there a fix for CVE-2026-56063?: A patch was published on 2026-06-26: NVD publication and patch availability confirmed for version 1.1.16 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-56063 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-56063?: Check whether you run bPlugins MailChimp Block 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

A broken access control vulnerability exists in the bPlugins MailChimp Block plugin for WordPress due to missing authorization checks (CWE-862) in certain functions. This allows a remote, unauthenticated attacker to execute actions that should be restricted to higher-privileged users. The vulnerability is rated with a CVSS score of 8.3, indicating a high impact on confidentiality, integrity, and availability. The issue is resolved in version 1.1.16.

Affected products

bPlugins MailChimp Block <= 1.1.15

Timeline

2026-05-14: disclosed: Reported by researcher Roll
2026-06-25: advisory: Patchstack advisory published
2026-06-26: patched: NVD publication and patch availability confirmed for version 1.1.16

References

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