CVE-2026-73365 in JetAppointment Plugin
Summary
by MITRE • 08/18/2026
Unauthenticated SQL Injection in JetAppointment <= 2.5.2 versions.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/18/2026
The vulnerability identified as an unauthenticated SQL injection flaw within JetAppointment versions prior to or equal to 2.5.2 represents a critical security deficiency that allows remote attackers to execute arbitrary Structured Query Language commands against the underlying database management system without requiring valid credentials. This type of vulnerability typically arises when web applications fail to properly sanitize user-supplied input before incorporating it into SQL queries used for data retrieval, modification, or deletion operations. In the context of JetAppointment, a WordPress plugin designed for managing appointments and bookings, this flaw likely exists in one or more endpoints that process parameters related to appointment scheduling, customer details, or administrative settings without adequate validation or parameterization mechanisms. The absence of authentication requirements significantly escalates the severity of the issue, as it removes the primary barrier preventing exploitation by any internet user with network access to the targeted application instance.
From a technical perspective, SQL injection vulnerabilities are categorized under CWE-89 in the Common Weakness Enumeration taxonomy, which specifically addresses Improper Neutralization of Special Elements used in an SQL Command. The root cause generally involves the direct concatenation of unsanitized variables into query strings rather than using prepared statements or parameterized queries that separate code from data. When a malicious actor submits crafted input containing SQL syntax such as single quotes, semicolons, and logical operators like OR 1=1, the database engine interprets these elements not as literal values but as executable commands. This can lead to unauthorized access to sensitive information stored in the database, including user credentials, personal identifiable information of customers, payment details, or administrative configuration data. The attacker may also leverage this flaw to modify existing records, insert malicious entries, or potentially drop tables depending on the privileges granted to the database account used by the application.
The operational impact of exploiting an unauthenticated SQL injection in a business-critical plugin like JetAppointment is substantial and multifaceted. Beyond the immediate risk of data exfiltration, which can lead to regulatory non-compliance under frameworks such as GDPR or CCPA due to the exposure of customer personal data, there are significant risks related to system integrity and availability. An attacker could potentially use advanced SQL injection techniques, including blind boolean-based or time-based inference methods if direct output is not visible, to enumerate database schema information and extract sensitive content incrementally. Furthermore, depending on the specific configuration of the backend database server, such as MySQL with certain privileges enabled, an attacker might attempt to write files to the web root or execute operating system commands through functions like INTO OUTFILE or xp_cmdshell in Microsoft SQL Server environments. This could result in full server compromise, turning the vulnerable application into a pivot point for further attacks against internal network resources.
In terms of threat modeling and adversary behavior, this vulnerability aligns with MITRE ATT&CK techniques related to Initial Access and Collection. Specifically, it maps to T1190 Exploit Public-Facing Application under the Initial Access tactic, where adversaries leverage software vulnerabilities to gain entry into a system. Once inside, the extraction of data corresponds to T1005 Data from Local System or T1213 Data from Information Repositories within the Collection tactic. The lack of authentication requirement means that automated scanning tools and opportunistic attackers can easily discover and exploit this weakness across large portions of the internet using broad-spectrum search engines, leading to widespread compromise if left unpatched. Organizations relying on JetAppointment for their appointment scheduling infrastructure face a high probability of being targeted by such automated campaigns unless immediate remediation steps are taken.
Mitigation strategies must prioritize both immediate patching and long-term secure coding practices. The most effective and urgent action is to upgrade the JetAppointment plugin to version 2.5.3 or later, where the developers have presumably addressed this input validation flaw by implementing proper parameterization of SQL queries. Until an update can be applied in environments with strict change control policies, temporary mitigations should include deploying a Web Application Firewall configured with rulesets capable of detecting and blocking common SQL injection patterns within HTTP request parameters. Additionally, administrators should enforce the principle of least privilege for database accounts used by the application, ensuring that the account does not have permissions to perform administrative actions such as file system access or executing operating system commands. Regular security audits and code reviews focusing on input validation are essential to prevent similar vulnerabilities from being introduced in future updates or custom integrations with other plugins.