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OpenAdvisories

Weakness (CWE)

CWE-79: Cross-site Scripting

Base Improper Neutralization of Input During Web Page Generation

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.

How to prevent it (8 mitigations)

  1. Architecture and Design

    Use 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.

  2. Implementation, Architecture and Design

    Understand 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 encoding strategies.

    For any data that will be output to another web page, especially any data that was received from external inputs, use the appropriate encoding on all non-alphanumeric characters.

    Parts of the same output document may require different encodings, which will vary depending on whether the output is in the:

    - HTML body

    - Element attributes (such as src="XYZ")

    - URIs

    - JavaScript sections

    - Cascading Style Sheets and style property

    etc. Note that HTML Entity Encoding is only appropriate for the HTML body.

    Consult the XSS Prevention Cheat Sheet [REF-724] for more details on the types of encoding and escaping that are needed.

  3. Architecture and Design, Implementation

    Understand 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 through API calls.

  4. Architecture and Design

    For 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.

  5. Architecture and Design

    If 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.

  6. Implementation

    Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.

    The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.

  7. Implementation

    With Struts, write all data from form beans with the bean's filter attribute set to true.

  8. Implementation

    To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XmlHttpRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.

Source: MITRE CWE-79

All Critical High Medium Low Exploited only Public exploit

32,780 results · Feed

  • Medium 6.8
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    CVE-2026-57742

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    CVE-2026-78534

    WordPress Educavo theme <= 3.4.2 - Cross Site Scripting (XSS) vulnerability

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    CVE-2026-78532

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    CVE-2026-62116

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    CVE-2026-62095

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    Unauthenticated Cross Site Scripting (XSS) in Biolife <= 3.2.3 versions.

    kutethemes Biolife
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    CVE-2026-62093

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    CVE-2026-62091

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  • High 7.1
    CVE-2026-62082

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    An-Themes Pin WP
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    CVE-2026-62064

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    bracketweb Ambed
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    WordPress Before After Image Comparison – Image comparison for WP plugin <= 1.1.21 - Cross Site Scripting (XSS) vulnerability

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    bPlugins Before After Image Comparison – Image comparison for WP
  • High 7.1
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  • High 7.1
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    TieLabs Jannah
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  • High 7.1
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  • High 7.1
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    drfuri Martfury - WooCommerce Marketplace WordPress Theme Web / CMS
  • High 7.1
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    WordPress ThemeStek Extras for LabtechCO Theme plugin <= 8.4 - Reflected Cross Site Scripting (XSS) vulnerability

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    themeStek ThemeStek Extras for LabtechCO Theme
  • High 7.1
    CVE-2026-97264

    WordPress WPAdverts plugin <= 2.3.4 - Cross Site Scripting (XSS) vulnerability

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Greg Winiarski WPAdverts wpadverts allows Reflected XSS.This issue affects WPAdverts: from n/a through 2.3.4.

    Greg Winiarski WPAdverts
  • High 7.1
    CVE-2026-97263

    WordPress WPAdverts plugin <= 2.3.4 - Cross Site Scripting (XSS) vulnerability

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Greg Winiarski WPAdverts wpadverts allows Stored XSS.This issue affects WPAdverts: from n/a through 2.3.4.

    Greg Winiarski WPAdverts
  • High 7.1
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    WPMU DEV Forminator
  • High 7.2
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    HivePress <= 1.7.31 - Unauthenticated Stored Cross-Site Scripting via Custom User Attribute Value via Registration Form

    The HivePress – Business Directory, Listings & Classified Ads Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '<custom user attribute field name, e.g. profile_test>' parameter in all versions up to, and including, 1.7.31 due t…

    HivePress HivePress – Business Directory, Listings & Classified Ads Plugin Web / CMS
  • Medium 6.4
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    PeproDev Ultimate Profile Solutions <= 8.2.36 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'button' Attribute

    The PeproDev Ultimate Profile Solutions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `logout-url` shortcode's 'button' attribute in all versions up to, and including, 8.2.36 due to insufficient input sanitization and output escapi…

    peprodev PeproDev Ultimate Profile Solutions Web / CMS
  • High 7.1
    CVE-2026-93951

    WordPress Zeinet theme <= 1.0.0 - Reflected Cross Site Scripting (XSS) vulnerability

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Bracketweb Zeinet zeinet allows Reflected XSS.This issue affects Zeinet: from n/a through 1.0.0.

    bracketweb Zeinet
  • Medium 6.4
    CVE-2026-97340

    Avada | Website Builder For WordPress & WooCommerce <= 7.16.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'author_facebook' User Profile Field

    The Avada | Website Builder For WordPress & WooCommerce theme for WordPress is vulnerable to Stored Cross-Site Scripting via the user profile 'Author Page' social link contact-method fields (author_facebook, author_twitter, author_linkedin, author_dribble, au…

    ThemeFusion Avada | Website Builder For WordPress & WooCommerce Web / CMS
  • Medium 6.4
    CVE-2026-103478

    Premium Packages <= 7.2.6 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'checkout[billing][phone]' Parameter

    The Premium Packages – Sell Digital Products Securely plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'checkout[billing][phone] (and state / taxid / email)' parameter in all versions up to, and including, 7.2.6 due to insufficient in…

    codename065 Premium Packages – Sell Digital Products Securely Web / CMS
  • Medium 6.4
    CVE-2026-102774

    SureDash <= 1.12.1 - Authenticated (Subscriber+) Stored DOM-Based Cross-Site Scripting via Image 'alt' Attribute in Community Post Content

    The SureDash – Community, Courses & Member Dashboard plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via Image 'alt' Attribute in Community Post Content in all versions up to, and including, 1.12.1 due to insufficient input sanitiz…

    Brainstorm Force SureDash – Community, Courses & Member Dashboard Web / CMS
  • High 7.2
    CVE-2026-100178

    WPAdverts <= 2.3.4 - Unauthenticated Stored Cross-Site Scripting via 'adverts_location' Parameter

    The WPAdverts – Classifieds Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'adverts_location' parameter in all versions up to, and including, 2.3.4 due to insufficient input sanitization and output escaping. This makes it pos…

    gwin WPAdverts – Classifieds Plugin Web / CMS