CVE-2023-33561 in Time Slots Booking Calendar
Summary
by MITRE • 08/02/2023
Improper input validation of password parameter in PHP Jabbers Time Slots Booking Calendar v 3.3 results in insecure passwords.
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Analysis
by VulDB Data Team • 01/05/2026
The vulnerability identified as CVE-2023-33561 affects PHP Jabbers Time Slots Booking Calendar version 3.3 and stems from inadequate input validation mechanisms for password parameters. This weakness resides in the application's authentication framework where user-provided password data fails to undergo proper sanitization and validation checks before being processed or stored within the system. The flaw allows attackers to submit passwords that do not meet security requirements, potentially enabling the creation of weak or easily guessable credentials that compromise the overall security posture of the booking calendar system.
From a technical perspective, the vulnerability manifests as a failure to implement robust password validation controls that would normally enforce minimum complexity requirements, length restrictions, and forbidden character sequences. This improper input validation creates an attack surface where malicious actors can exploit the system's lax security controls to bypass standard authentication protections. The issue is categorized under CWE-20, which represents improper input validation, and specifically aligns with CWE-521, weak password requirements, demonstrating how inadequate validation can lead to credential security weaknesses.
The operational impact of this vulnerability extends beyond simple authentication bypass scenarios, as it can enable various attack vectors including credential stuffing, brute force attacks, and password reuse exploitation. Attackers can leverage this weakness to create accounts with predictable or weak passwords, potentially gaining unauthorized access to user data, calendar information, and booking records. The vulnerability affects the integrity and confidentiality of the system by allowing unauthorized parties to compromise user accounts and access sensitive scheduling information. Organizations utilizing this calendar system face increased risk of data breaches, unauthorized modifications to booking schedules, and potential escalation to broader system compromise.
Security professionals should address this vulnerability through immediate implementation of proper password validation controls that enforce strong password policies. Mitigation strategies should include enforcing minimum password length requirements of at least 12 characters, implementing complexity requirements that mandate uppercase, lowercase, numeric, and special characters, and incorporating password strength checking mechanisms. The system should also validate that passwords do not contain common patterns, dictionary words, or user-specific information that could facilitate guessing attacks. Organizations should consider implementing account lockout mechanisms after failed authentication attempts and regularly audit password policies to ensure compliance with industry standards such as NIST SP 800-63B and ISO 27001 requirements for authentication controls. Additionally, the fix should incorporate proper input sanitization techniques and validate all user inputs against predefined security criteria before processing any authentication requests. This vulnerability demonstrates the critical importance of implementing comprehensive input validation and authentication security measures to protect against credential-based attacks and maintain the overall integrity of web applications.