CVE-2026-84764

Simply Schedule Appointments <= 1.6.12.23 - Cross-Site Request Forgery

2026-09-02 00:00
Anthony Green of Greenhat Security

Strategic Overview

Status
Patched in 1.6.12.24
Affected Plugin
Simply Schedule Appointments
Affected Version
<= 1.6.12.23
CVSS
4.3Medium
Weakness type
CWE-352 · Cross-Site Request Forgery (CSRF)
CVE
CVE-2026-84764
View all Simply Schedule Appointments vulnerabilities

At a glance

CVE-2026-84764 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Simply Schedule Appointments WordPress plugin, affecting versions <= 1.6.12.23. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.6.12.24; sites on affected versions should update now. Disclosed September 2026, reported by Anthony Green of Greenhat Security.

Vulnerability Overview

The Simply Schedule Appointments plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.6.12.23. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Simply Schedule Appointments <= 1.6.12.23 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Simply Schedule Appointments the fix is 1.6.12.24: builds <= 1.6.12.23 are affected, anything from 1.6.12.24 onward is not.

Remediation

Update to version 1.6.12.24, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Simply Schedule Appointments: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Simply Schedule Appointments 1.6.12.24 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-84764https://www.wordfence.com/threat-intel/vulnerabilities/id/30502e0f-cae6-4d48-837c-77127c39731bhttps://nvd.nist.gov/vuln/detail/CVE-2026-84764

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C