CVE-2026-87966: CWE-639 Authorization Bypass Through User-Controlled Key in Easy Appointments
The Easy Appointments WordPress plugin before 4.0.2.2 does not perform an ownership or authorization check on its unauthenticated appointment-reservation endpoint before updating an existing appointment identified by a request-supplied id, allowing unauthenticated attackers to overwrite, and through a follow-on cleanup delete, arbitrary appointments.
AI Analysis
Technical Summary
CVE-2026-87966 is an authorization bypass vulnerability in the Easy Appointments WordPress plugin prior to version 4.0.2.2. The vulnerability arises because the plugin fails to perform ownership or authorization checks on its unauthenticated appointment-reservation endpoint. Attackers can exploit this by supplying an appointment ID in a request to update an existing appointment without authentication, allowing them to overwrite or delete arbitrary appointments.
Potential Impact
An unauthenticated attacker can modify or delete appointments arbitrarily, potentially disrupting scheduling and appointment management for affected sites using vulnerable versions of the Easy Appointments plugin.
Mitigation Recommendations
Upgrade the Easy Appointments plugin to version 4.0.2.2 or later, where this authorization bypass vulnerability has been fixed. No other mitigation steps are indicated.
CVE-2026-87966: CWE-639 Authorization Bypass Through User-Controlled Key in Easy Appointments
Description
The Easy Appointments WordPress plugin before 4.0.2.2 does not perform an ownership or authorization check on its unauthenticated appointment-reservation endpoint before updating an existing appointment identified by a request-supplied id, allowing unauthenticated attackers to overwrite, and through a follow-on cleanup delete, arbitrary appointments.
CVSS v3.1
Score 5.3medium
Affected software
Easy Appointments
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-87966 is an authorization bypass vulnerability in the Easy Appointments WordPress plugin prior to version 4.0.2.2. The vulnerability arises because the plugin fails to perform ownership or authorization checks on its unauthenticated appointment-reservation endpoint. Attackers can exploit this by supplying an appointment ID in a request to update an existing appointment without authentication, allowing them to overwrite or delete arbitrary appointments.
Potential Impact
An unauthenticated attacker can modify or delete appointments arbitrarily, potentially disrupting scheduling and appointment management for affected sites using vulnerable versions of the Easy Appointments plugin.
Mitigation Recommendations
Upgrade the Easy Appointments plugin to version 4.0.2.2 or later, where this authorization bypass vulnerability has been fixed. No other mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-09T17:46:45.657Z
- State
- PUBLISHED
Threat ID: 6aacd5a355bf5e2cf5955f2b
Added to database: 09/18/2026, 06:09:39 UTC
Last enriched: 09/18/2026, 06:17:07 UTC
Last updated: 09/19/2026, 00:16:23 UTC
Views: 12
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