CVE-2026-59558
Received Received - Intake

Unauthenticated XSS in Booking Calendar

Publication date: 2026-07-27

Last updated on: 2026-07-27

Assigner: Patchstack

Description
Unauthenticated Cross Site Scripting (XSS) in Booking Calendar <= 11.4.2 versions.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-07-27
Last Modified
2026-07-27
Generated
2026-07-27
AI Q&A
2026-07-27
EPSS Evaluated
N/A
NVD
CVE-2026-59558
EUVD
EUVD-2026-49225

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
booking_calendar booking_calendar to 11.4.2 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability found in Booking Calendar plugin versions 11.4.2 and below. It allows attackers to inject malicious scripts into web pages viewed by other users without needing authentication.

Detection Guidance

To detect this XSS vulnerability in Booking Calendar <= 11.4.2, inspect web forms or input fields for improper input validation. Test with payloads like <script>alert(1)</script> in fields such as name, email, or booking details. Check server responses for script execution.

Impact Analysis

An attacker could steal user sessions, redirect users to malicious sites, or deface the website. Users with admin privileges could have their accounts compromised, leading to full site takeover.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face fines or legal consequences if exploited.

Mitigation Strategies

Update Booking Calendar to the latest version above 11.4.2 to patch the XSS vulnerability. If an update is not available, consider disabling or removing the plugin until a fix is released.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-59558. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart