EUVD-2026-21852
GHSA-hh82-cfxx-fmf9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
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8DescriptionCVE.org
A vulnerability has been found in code-projects Simple ChatBox up to 1.0. Affected by this vulnerability is an unknown functionality of the file /chatbox/insert.php of the component Endpoint. Such manipulation of the argument msg leads to cross site scripting. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.
AnalysisAI
Cross-site scripting (XSS) in Simple ChatBox up to version 1.0 allows remote attackers to inject malicious scripts via the msg parameter in the /chatbox/insert.php endpoint, with user interaction required. The vulnerability has publicly available exploit code and affects the PHP-based chat application component. Impact is limited to integrity of user sessions, but the attack vector is remote and requires no authentication.
Technical ContextAI
Simple ChatBox is a PHP-based chat application component vulnerable to reflected or stored cross-site scripting (CWE-79) due to insufficient input validation and output encoding in the insert.php endpoint. The msg parameter passes user-supplied data to the application without proper sanitization, allowing attackers to inject arbitrary HTML and JavaScript that executes in the context of other users' browsers. The vulnerability exists in the endpoint handler responsible for processing chat messages, a common attack surface in web applications that accept user-generated content without server-side validation or client-side output encoding.
RemediationAI
Upgrade Simple ChatBox to a patched version if available from code-projects.org. If no newer version is released, implement server-side input validation on the msg parameter by rejecting or sanitizing HTML special characters, and apply output encoding using htmlspecialchars() or equivalent PHP functions when displaying chat messages. Additionally, implement Content Security Policy (CSP) headers to restrict inline script execution. Consult https://vuldb.com/vuln/357039 for additional vulnerability details and vendor advisories.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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