CVE-2023-27212 in Online Pizza Ordering System
Summary
by MITRE • 03/09/2023
A cross-site scripting (XSS) vulnerability in /php-opos/signup.php of Online Pizza Ordering System 1.0 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the redirect parameter.
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Analysis
by VulDB Data Team • 11/16/2025
The vulnerability identified as CVE-2023-27212 represents a critical cross-site scripting flaw within the Online Pizza Ordering System version 1.0, specifically affecting the /php-opos/signup.php endpoint. This weakness stems from inadequate input validation and sanitization mechanisms that fail to properly process user-supplied data within the redirect parameter. The vulnerability manifests when attackers craft malicious payloads that exploit the application's failure to sanitize or escape special characters in the redirect parameter, allowing them to inject arbitrary HTML and JavaScript code into the web application's response. The flaw resides in the application's trust of user input without proper validation, creating an avenue for attackers to manipulate the application's behavior and potentially execute malicious scripts in the context of other users' browsers.
The technical exploitation of this vulnerability follows the standard XSS attack pattern where an attacker crafts a malicious URL containing a crafted payload in the redirect parameter. When a victim clicks on this malicious link, the application processes the redirect parameter without proper sanitization, resulting in the execution of the injected JavaScript code within the victim's browser. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications. The attack vector operates through the web application's handling of the redirect parameter, where the application fails to implement proper output encoding or validation techniques to prevent malicious input from being executed as code. The vulnerability's impact is amplified by the fact that it occurs during the signup process, a critical user interaction point that can be easily accessed and manipulated by attackers.
The operational impact of CVE-2023-27212 extends beyond simple script execution, potentially enabling attackers to perform session hijacking, steal user credentials, manipulate application data, or redirect users to malicious sites. This vulnerability can be leveraged to create persistent XSS attacks that affect multiple users, particularly those who interact with the signup functionality or are redirected through the vulnerable parameter. The attack chain typically involves the attacker identifying the vulnerable redirect parameter, crafting a malicious payload that executes in the victim's browser, and then using this execution context to perform more sophisticated attacks such as cookie theft, credential harvesting, or data exfiltration. According to ATT&CK framework, this vulnerability maps to T1566.001 (Phishing: Spearphishing Attachments) and T1059.007 (Command and Scripting Interpreter: JavaScript) as attackers can use the XSS to deliver malicious JavaScript payloads and establish persistent access to user sessions.
Mitigation strategies for this vulnerability must address the root cause of improper input validation and implement comprehensive security controls. The primary remediation involves implementing proper input validation and output encoding mechanisms that sanitize all user-supplied data before processing or rendering it within the application. Developers should employ context-specific encoding techniques such as HTML entity encoding for output contexts and implement strict input validation that rejects or sanitizes potentially malicious payloads. Additionally, the application should implement proper Content Security Policy headers to limit the sources from which scripts can be executed and utilize secure redirect mechanisms that validate and sanitize redirect URLs against a predefined whitelist of trusted domains. The implementation of these measures aligns with OWASP Top 10 security practices and helps prevent similar vulnerabilities from occurring in future application versions. Regular security testing including dynamic and static analysis should be implemented to identify and remediate similar flaws before they can be exploited by malicious actors.