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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 23654

23654 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-2021-29109 A reflected XSS vulnerability in Esri Portal for ArcGIS version 10.9. — Portal for ArcGIS 6.1 -2021-10-01
CVE-2021-38675 Stored XSS Vulnerability in Image2PDF — Image2PDF 5.4 Medium2021-10-01
CVE-2021-34356 Stored XSS Vulnerability in Photo Station — Photo Station 7.6 High2021-10-01
CVE-2021-34355 Stored XSS Vulnerability in Photo Station — Photo Station 7.6 High2021-10-01
CVE-2021-34354 Stored Cross-site Scripting Vulnerability in Photo Station — Photo Station 7.6 High2021-10-01
CVE-2021-41101 CORS `Access-Control-Allow-Origin` settings are too lenient — wire-server 5.7 Medium2021-09-30
CVE-2021-25963 Shuup - Reflected XSS in Error Page — shuup 6.1 Medium2021-09-30
CVE-2021-25959 OpenCRX - Reflected Cross-Site Scripting in Password Reset Functionality — opencrx-core-config 6.1 Medium2021-09-29
CVE-2021-41095 XSS via blocked watched word in error message — discourse 4.2 Medium2021-09-27
CVE-2021-40714 Adobe Experience Manager Reflected Cross Site Scripting via accesskey parameter — Experience Manager 6.1 Medium2021-09-27
CVE-2021-40711 Adobe Experience Manager Stored Cross-Site Scripting Could Lead to Arbitrary Code Execution — Experience Manager 5.4 Medium2021-09-27
CVE-2021-36845 YITH Maintenance Mode (WordPress plugin) <= 1.3.8 - Multiple Authenticated Stored Cross-Site Scripting (XSS) vulnerabilities — YITH Maintenance Mode (WordPress plugin) 6.9 Medium2021-09-27
CVE-2021-36841 YITH Maintenance Mode (WordPress plugin) <= 1.3.7 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability. — YITH Maintenance Mode (WordPress plugin) 6.9 Medium2021-09-27
CVE-2021-36875 WordPress uListing plugin <= 2.0.5 - Auth. Reflected Cross-Site Scripting (XSS) vulnerability — Directory Listings WordPress plugin – uListing 5.9 Medium2021-09-27
CVE-2021-24671 MX Time Zone Clocks < 3.4.1 - Contributor+ Cross-Site Scripting — MX Time Zone Clocks 5.4 -2021-09-27
CVE-2021-24670 CoolClock < 4.3.5 - Contributor+ Stored Cross-Site Scripting — CoolClock – a Javascript Analog Clock 5.4 -2021-09-27
CVE-2021-24660 PostX Gutenberg Blocks Saved Templates Addon < 2.4.10 - Contributor+ Stored Cross-Site Scripting — PostX – Gutenberg Blocks for Post Grid 5.4 -2021-09-27
CVE-2021-24659 PostX Gutenberg Blocks for Post Grid < 2.4.10 - Contributor+ Stored Cross-Site Scripting — PostX – Gutenberg Blocks for Post Grid 5.4 -2021-09-27
CVE-2021-24643 WP Map Block < 1.2.3 - Contributor+ Stored Cross-Site Scripting — WP Map Block – Gutenberg Map Block for Google Map and OpenStreet Map 5.4 -2021-09-27
CVE-2021-24634 Recipe Card Blocks < 2.8.3 - Contributor+ Stored Cross-Site Scripting — Recipe Card Blocks by WPZOOM 5.4 -2021-09-27
CVE-2021-24632 Recipe Card Blocks < 2.8.1 - Reflected Cross-Site Scripting — Recipe Card Blocks by WPZOOM 6.1 -2021-09-27
CVE-2021-24610 TranslatePress < 2.0.9 - Authenticated Stored Cross-Site Scripting — Translate Multilingual sites – TranslatePress 5.4 -2021-09-27
CVE-2021-24569 Cookie Notice & Compliance for GDPR / CCPA < 2.1.2 - Admin+ Stored Cross-Site Scripting — Cookie Notice & Compliance for GDPR / CCPA 4.8 -2021-09-27
CVE-2021-23054 F5 BIG-IP APM 跨站脚本漏洞 — BIG-IP APM 5.4 -2021-09-27
CVE-2021-3830 Cross-site Scripting (XSS) - Stored in btcpayserver/btcpayserver — btcpayserver/btcpayserver 5.4 -2021-09-26
CVE-2021-36823 WordPress Absolutely Glamorous Custom Admin plugin <= 6.8 - Auth. Stored Cross-Site Scripting (XSS) vulnerability — AGCA - Absolutely Glamorous Custom Admin (WordPress plugin) 6.6 Medium2021-09-23
CVE-2021-36873 WordPress iQ Block Country plugin <= 1.2.11 - Authenticated Persistent Cross-Site Scripting (XSS) vulnerability — iQ Block Country 5.5 Medium2021-09-23
CVE-2021-36872 WordPress Popular Posts plugin <= 5.3.3 - Authenticated Persistent Cross-Site Scripting (XSS) vulnerability — WordPress Popular Posts 5.5 Medium2021-09-23
CVE-2021-22948 revive-adserver 安全特征问题漏洞 — https://github.com/revive-adserver/revive-adserver 9.1 -2021-09-23
CVE-2021-37860 Mattermost 跨站脚本漏洞 — Mattermost 3.7 Low2021-09-22

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 23654 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.