CVE-2026-17023
Received Received - Intake

Salon Booking System OAuth Token Hijack via Google Calendar Integration

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: WPScan

Description
The Salon Booking System WordPress plugin through 10.30.33 does not perform any capability check or validate an OAuth state value on its Google Calendar authorization callback, which is also hooked for unauthenticated users, allowing an unauthenticated attacker to overwrite the site's stored Google Calendar connection tokens with attacker-controlled ones and hijack the integration. Exploitation requires the site to have configured its own Google OAuth client for the calendar feature.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-17023
EUVD
EUVD-2026-55004

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wp_plugin salon_booking_system to 10.30.33 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

The vulnerability in the Salon Booking System WordPress plugin allows an unauthenticated attacker to hijack the site's Google Calendar integration by exploiting a flaw in the OAuth callback process. The plugin does not check user capabilities or validate the OAuth state value during authorization, enabling attackers to replace stored Google Calendar tokens with their own if the site uses a custom Google OAuth client.

Detection Guidance

Check if the Salon Booking System plugin version is 10.30.33 or lower. Inspect the plugin's code for missing capability checks or OAuth state validation in the Google Calendar authorization callback. Look for unauthorized modifications to stored Google Calendar connection tokens.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain unauthorized access to the site's Google Calendar data, potentially viewing, modifying, or deleting calendar events. This could disrupt business operations or lead to data leaks if sensitive calendar information is involved.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data stored in Google Calendar, potentially violating GDPR or HIPAA compliance. Organizations may face legal penalties or reputational damage if such data breaches occur due to insufficient access controls.

Mitigation Strategies

Update the Salon Booking System plugin to the latest version if available. Disable the Google Calendar integration feature if not required. Review and revoke any unauthorized Google OAuth client configurations linked to the plugin.

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