Is CVE-2026-125437 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-125437 being exploited in the wild.

How severe is CVE-2026-125437?

Medium severity, with a CVSS score of 5.3, published 11 November 2026.

Which products and versions are affected?

NSquared Simply Schedule Appointments through 1.6.13.0.

Is there a fix for CVE-2026-125437?

Yes: fixed in 1.6.13.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-125437 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-125437?

Check whether you run NSquared Simply Schedule Appointments 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-2026-125437: NSquared Simply Schedule Appointments broken access control

CVE-2026-125437 · Severity: medium · CVSS 5.3 · Published 2026-11-11

Simply Schedule Appointments is a WordPress plugin that allows users to book appointments online. A broken access control vulnerability allows unauthenticated users to access pages or perform actions they should not be permitted to, potentially exposing appointment data or allowing unauthorized scheduling actions. The vulnerability affects all versions through 1.6.13.0 and has been patched in version 1.6.13.4.

Technologies: NSquared Simply Schedule Appointments. Vendors: NSquared.

Quick answers

Is CVE-2026-125437 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-125437 being exploited in the wild.
How severe is CVE-2026-125437?: Medium severity, with a CVSS score of 5.3, published 11 November 2026.
Which products and versions are affected?: NSquared Simply Schedule Appointments through 1.6.13.0.
Is there a fix for CVE-2026-125437?: Yes: fixed in 1.6.13.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-125437 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-125437?: Check whether you run NSquared Simply Schedule Appointments 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.

How to fix

Fixed in: 1.6.13.4

Technical details

The plugin fails to enforce proper authorization checks on sensitive functionality, allowing unauthenticated attackers to bypass access controls via the network. Attackers can access appointment data and perform actions without proper authentication or permission verification. A fix is available in version 1.6.13.4 and later.

Affected products

NSquared Simply Schedule Appointments through 1.6.13.0

Timeline

2026-10-29: disclosed
2026-11-11: advisory

References

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