CVE-2026-3251 in Mezunum Satiyorum
Summary
by MITRE • 07/10/2026
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Webremium Istanbul Web Design Mezunum Satiyorum allows Stored XSS.
This issue affects Mezunum Satiyorum: from 1.2.504 through 10072026. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 07/10/2026
This vulnerability represents a critical stored cross-site scripting flaw that resides within the web application framework of Mezunum Satiyorum version range 1.2.504 through 10072026. The issue stems from inadequate input validation and sanitization during the dynamic generation of web pages, specifically when processing user-submitted content that gets stored in the application's database. The vulnerability is classified as CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that allows malicious actors to inject client-side scripts into web pages viewed by other users. This particular implementation flaw enables attackers to execute arbitrary JavaScript code within the context of other users' browsers, potentially leading to complete session hijacking, credential theft, and unauthorized actions performed on behalf of victims.
The operational impact of this stored XSS vulnerability extends beyond simple script execution as it creates persistent attack vectors that can compromise user sessions and data integrity. When users view pages containing maliciously injected scripts, the browser executes these scripts with the privileges of the victim's session, potentially allowing attackers to access sensitive information, modify data, or perform unauthorized transactions. The vulnerability is particularly dangerous because it allows attackers to inject malicious code that persists in the application's database, meaning that every user who accesses affected content becomes a potential target. This type of attack aligns with ATT&CK technique T1531 - Account Access Token Manipulation, as successful exploitation can lead to unauthorized access token theft and session hijacking.
The technical flaw manifests when user input intended for display within web pages is not properly sanitized or encoded before being rendered in HTML contexts. Attackers can craft malicious payloads that include script tags, event handlers, or other JavaScript constructs that will execute when legitimate users browse pages containing the stored malicious content. The attack chain typically involves an attacker submitting malicious input through forms, comments, or other user-input mechanisms, which gets stored in the database and later rendered on web pages without proper output encoding. This vulnerability is particularly concerning for applications handling user-generated content where input validation is insufficient and output encoding is either missing or inadequate for the specific context where data is displayed.
Mitigation strategies should focus on implementing robust input validation, output encoding, and secure coding practices throughout the application development lifecycle. The most effective approach involves applying proper HTML escaping or encoding to all dynamic content before rendering it in web pages, particularly when dealing with user-submitted data. Implementing Content Security Policy headers can provide additional defense-in-depth measures to prevent script execution from unauthorized sources. Regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities across the application codebase. The vulnerability also highlights the importance of maintaining up-to-date vendor communications and security advisories, as the lack of response from the vendor in this case represents a significant gap in responsible disclosure practices that leaves users vulnerable to exploitation.
This stored XSS vulnerability demonstrates the critical importance of input validation and output encoding in web application security, particularly for applications handling user-generated content. The absence of proper sanitization mechanisms allows attackers to inject malicious scripts that persist in the application's database and execute against all users who encounter the affected content. The vulnerability's impact is amplified by its persistence, as stored payloads can affect multiple users over extended periods without requiring repeated exploitation attempts. Organizations must implement comprehensive security controls including input validation frameworks, output encoding mechanisms, and regular security assessments to prevent similar vulnerabilities from compromising their applications and user data integrity.