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CWE-79 (在Web页面生成时对输入的转义处理不恰当(跨站脚本)) — Vulnerability Class 21763

21763 vulnerabilities classified as CWE-79 (在Web页面生成时对输入的转义处理不恰当(跨站脚本)). AI Chinese analysis included.

CWE-79 represents a critical input validation weakness where software fails to properly sanitize user-supplied data before rendering it in web pages. Attackers typically exploit this vulnerability by injecting malicious scripts, often JavaScript, into trusted websites. When other users view the compromised page, the embedded code executes in their browsers, allowing the attacker to steal session cookies, hijack accounts, or redirect victims to phishing sites. This breach of trust undermines user privacy and application integrity. To prevent such attacks, developers must implement robust input validation and output encoding strategies. By strictly filtering incoming data and ensuring that all dynamic content is properly escaped before being processed by the browser, developers can neutralize dangerous inputs and effectively mitigate the risk of cross-site scripting vulnerabilities.

MITRE CWE Description
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. There are many variants of cross-site scripting, characterized by a variety of terms or involving different attack topologies. However, they all indicate the same fundamental weakness: improper neutralization of dangerous input between the adversary and a victim.
Common Consequences (3)
Access Control, ConfidentialityBypass Protection Mechanism, Read Application Data
The most common attack performed with cross-site scripting involves the disclosure of private information stored in user cookies, such as session information. Typically, a malicious user will craft a client-side script, which -- when parsed by a web browser -- performs some activity on behalf of the…
Integrity, Confidentiality, AvailabilityExecute Unauthorized Code or Commands
In some circumstances it may be possible to run arbitrary code on a victim's computer when cross-site scripting is combined with other flaws, for example, "drive-by hacking."
Confidentiality, Integrity, Availability, Access ControlExecute Unauthorized Code or Commands, Bypass Protection Mechanism, Read Application Data
The consequence of an XSS attack is the same regardless of whether it is stored or reflected. The difference is in how the payload arrives at the server. XSS can cause a variety of problems for the end user that range in severity from an annoyance to complete account compromise. Some cross-site scri…
Mitigations (5)
Architecture and DesignUse a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482]. Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and Apache Wicket.
Implementation, Architecture and DesignUnderstand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages. Study all expected communication protocols and data representations to determine the required e…
Architecture and Design, ImplementationUnderstand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly throug…
Effectiveness: Limited
Architecture and DesignFor any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Architecture and DesignIf available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
Examples (2)
The following code displays a welcome message on a web page based on the HTTP GET username parameter (covers a Reflected XSS (Type 1) scenario).
$username = $_GET['username']; echo '<div class="header"> Welcome, ' . $username . '</div>';
Bad · PHP
http://trustedSite.example.com/welcome.php?username=<Script Language="Javascript">alert("You've been attacked!");</Script>
Attack
The following code displays a Reflected XSS (Type 1) scenario.
<% String eid = request.getParameter("eid"); %> ... Employee ID: <%= eid %>
Bad · JSP
<% protected System.Web.UI.WebControls.TextBox Login; protected System.Web.UI.WebControls.Label EmployeeID; ... EmployeeID.Text = Login.Text; %> <p><asp:label id="EmployeeID" runat="server" /></p>
Bad · ASP.NET
CVE IDTitleCVSSSeverityPublished
CVE-2026-4279 Bread & Butter: Content Gating for Verified Leads <= 8.2.0.25 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes — Bread & Butter: AI-Powered Lead Intelligence 6.4 Medium2026-04-22
CVE-2026-4082 ER Swiffy Insert <= 1.0.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes — ER Swiffy Insert 6.4 Medium2026-04-22
CVE-2026-5820 Zypento Blocks <= 1.0.6 - Authenticated (Author+) Stored Cross-Site Scripting via Table of Contents Block — Zypento Blocks 6.4 Medium2026-04-22
CVE-2026-40451 DeepL for Chrome 跨站脚本漏洞 — Chrome browser extension 6.1AIMediumAI2026-04-22
CVE-2026-41063 WWBN AVideo has incomplete fix for CVE-2026-33500 (XSS) — AVideo 5.4 Medium2026-04-21
CVE-2026-41061 WWBN AVideo Vulnerable to stored XSS via Unanchored Duration Regex in Video Encoder Receiver — AVideo 5.4 Medium2026-04-21
CVE-2026-40927 Docmost: XSS in Comments with JavaScript URI — docmost 5.4 Medium2026-04-21
CVE-2026-40878 mailcow-dockerized Login Page has Reflected Parameter Injection / Wrong-Context XSS Escaping — mailcow-dockerized 8.2AIHighAI2026-04-21
CVE-2026-40875 mailcow: dockerized vulnerable to stored XSS in user login history real_rip — mailcow-dockerized 6.1AIMediumAI2026-04-21
CVE-2026-40873 mailcow: dockerized vulnerable to stored XSS in Quarantine attachment filenames — mailcow-dockerized 6.1AIMediumAI2026-04-21
CVE-2026-40872 mailcow: dockerized vulnerable to stored XSS in autodiscover logs email address field — mailcow-dockerized 6.1AIMediumAI2026-04-21
CVE-2026-6745 Bagisto Custom Scripts cross site scripting — Bagisto 3.5 Low2026-04-21
CVE-2026-41456 Bludit CMS Reflected XSS via Search Plugin — bludit 6.1AIMediumAI2026-04-21
CVE-2026-6743 WebSystems WebTOTUM Calendar cross site scripting — WebTOTUM 3.5 Low2026-04-21
CVE-2026-35451 Twenty: Stored XSS via BlockNote FileBlock — twenty 5.7 Medium2026-04-21
CVE-2026-27937 October: Reflected XSS via DataTable Form Widget — october 3.1 Low2026-04-21
CVE-2026-40568 FreeScout Vulnerable to XSS via Mailbox Signature Due to Incomplete HTML Sanitization — freescout 8.5 High2026-04-21
CVE-2026-40565 FreeScout has Stored XSS / CSS Injection via linkify() — Unescaped URL in Anchor href — freescout 6.1 Medium2026-04-21
CVE-2025-41011 HTML injection in PHP Point Of Sale — PHP Point Of Sale 5.4AIMediumAI2026-04-21
CVE-2025-10354 Reflected Cross-Site Scripting (XSS) in Semantic MediaWiki — Semantic MediaWiki 6.1AIMediumAI2026-04-21
CVE-2026-3317 Reflected Cross-Site Scripting in Navigate CMS application — Navigate CMS 6.1AIMediumAI2026-04-21
CVE-2026-6712 Website LLMs.txt <= 8.2.6 - Authenticated (Admin+) Stored Cross-Site Scripting — Website LLMs.txt 4.4 Medium2026-04-21
CVE-2026-6711 Website LLMs.txt <= 8.2.6 - Reflected Cross-Site Scripting — Website LLMs.txt 6.1 Medium2026-04-21
CVE-2026-40497 FreeScout Vulnerable to CSS Injection via Stored Style Tag in Mailbox Signature (CSRF Token Exfiltration) — freescout 8.1 High2026-04-21
CVE-2026-5721 wpDataTables – WordPress Data Table, Dynamic Tables & Table Charts Plugin <= 6.5.0.4 - Unauthenticated Stored Cross-Site Scripting via CSV/Excel Data Import — wpDataTables – WordPress Data Table, Dynamic Tables & Table Charts Plugin 4.7 Medium2026-04-20
CVE-2026-4852 Image Source Control Lite – Show Image Credits and Captions <= 3.9.1 - Authenticated (Author+) Stored Cross-Site Scripting via 'Image Source' Field — Image Source Control Lite – Show Image Credits and Captions 6.4 Medium2026-04-20
CVE-2026-23753 GFI HelpDesk < 4.99.9 Stored XSS via charset Parameter — HelpDesk 4.8 Medium2026-04-20
CVE-2026-23752 GFI HelpDesk < 4.99.9 Stored XSS via companyname Parameter — HelpDesk 4.8 Medium2026-04-20
CVE-2026-23756 GFI HelpDesk < 4.99.9 Stored XSS via Troubleshooter Step Subject — HelpDesk 5.4 Medium2026-04-20
CVE-2026-23758 GFI HelpDesk < 4.99.9 Stored XSS via editsubject Parameter — HelpDesk 5.4AIMediumAI2026-04-20

Vulnerabilities classified as CWE-79 (在Web页面生成时对输入的转义处理不恰当(跨站脚本)) represent 21763 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.