CVE-2026-97079

Appointment Booking Plugin & Scheduling System – Webba Booking Calendar <= 6.5.0 - Authenticated (Subscriber+) Insecure Direct Object Reference

2026-09-24 00:00
sungbyeongchan

Strategic Overview

Status
Patched in 6.5.2
Affected Plugin
Easy Appointment Booking & Scheduling Plugin – Webba Booking Calendar
Affected Version
<= 6.5.0
CVSS
4.3Medium
Weakness type
CWE-639 · Authorization Bypass Through User-Controlled Key
CVE
CVE-2026-97079
View all Easy Appointment Booking & Scheduling Plugin – Webba Booking Calendar vulnerabilities

At a glance

CVE-2026-97079 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the Easy Appointment Booking & Scheduling Plugin WordPress plugin, affecting versions <= 6.5.0. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 6.5.2; sites on affected versions should update now. Disclosed September 2026, reported by sungbyeongchan.

Vulnerability Overview

The Appointment Booking Plugin & Scheduling System – Webba Booking Calendar plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.5.0. This is due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to perform an unauthorized action.

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 interaction from a victim user.

CWE-639: Authorization Bypass Through User-Controlled Key

Reaching this weakness in Easy Appointment Booking & Scheduling Plugin <= 6.5.0 takes an account at Subscriber level or above. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.

Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For Easy Appointment Booking & Scheduling Plugin the fix is 6.5.2: builds <= 6.5.0 are affected, anything from 6.5.2 onward is not.

Remediation

Update to version 6.5.2, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Easy Appointment Booking & Scheduling Plugin 6.5.2 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-97079https://www.wordfence.com/threat-intel/vulnerabilities/id/cbcb50dc-92b3-430c-bce3-81a46f4271e0https://nvd.nist.gov/vuln/detail/CVE-2026-97079

Related records

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