CWE-692—Incomplete Denylist to Cross-Site Scripting

Weakness Name

Incomplete Denylist to Cross-Site Scripting

Description

The product uses a denylist-based protection mechanism to defend against XSS attacks, but the denylist is incomplete, allowing XSS variants to succeed.

While XSS might seem simple to prevent, web browsers vary so widely in how they parse web pages, that a denylist cannot keep track of all the variations. The "XSS Cheat Sheet" [REF-714] contains a large number of attacks that are intended to bypass incomplete denylists.

Common Consequences

Scope:

Confidentiality, Integrity, Availability

Impact:

Execute Unauthorized Code or Commands

Related Weaknesses

• CWE-184Incomplete List of Disallowed Inputs