CVE-2026-25355 in Sanzo Plugin
Summary
by MITRE • 03/25/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in skygroup Sanzo sanzo allows Stored XSS.This issue affects Sanzo: from n/a through < 2.4.3.
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Analysis
by VulDB Data Team • 03/31/2026
This vulnerability represents a critical cross-site scripting flaw in the skygroup Sanzo sanzo web application that enables stored XSS attacks. The weakness occurs during the web page generation process where input validation and sanitization mechanisms fail to properly neutralize malicious user input before it is rendered back to other users. This allows attackers to inject malicious scripts that persist in the application's database or storage system, making the vulnerability particularly dangerous as it can affect multiple users over time. The vulnerability specifically impacts versions of Sanzo from the initial release through version 2.4.3, indicating that the flaw has existed for some time without proper remediation.
The technical implementation of this vulnerability stems from inadequate input sanitization routines that do not properly escape or encode user-supplied data before it is stored and subsequently displayed in web pages. When users submit content through forms, comments, or other input mechanisms, the application fails to validate or sanitize this data against known XSS attack patterns. This allows malicious payloads to be stored in the application's backend systems and executed whenever other users view the affected content. The stored nature of this vulnerability means that the malicious script persists even after the initial injection, making it particularly effective for long-term attacks and data exfiltration.
The operational impact of this vulnerability is severe as it provides attackers with the ability to execute arbitrary JavaScript code in the context of other users' browsers. Attackers can leverage this to steal session cookies, perform unauthorized actions on behalf of victims, redirect users to malicious sites, or extract sensitive information from the application. The stored nature of the vulnerability means that even users who are not actively interacting with the affected system can be compromised when they view pages containing the malicious content. This makes the vulnerability particularly dangerous for applications that handle sensitive user data or provide administrative functions.
Security professionals should implement comprehensive input validation and output encoding mechanisms to address this vulnerability. The fix should include implementing proper HTML entity encoding for all user-supplied content before rendering it in web pages, utilizing Content Security Policy headers to limit script execution, and implementing proper input sanitization routines that strip or encode potentially dangerous characters. Additionally, regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in the application's codebase. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and represents a clear violation of the principle of least privilege in web application security. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts. The ATT&CK framework categorizes this as a technique for code injection and credential access, making it a significant threat vector that requires immediate attention and remediation.