CWE-692: Incomplete Denylist to Cross-Site Scripting

ID CWE-692

Abstraction Compound

Structure Chain

Status Draft

Number of CVEs 2

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.

Applicable Platforms

Type	Class	Name	Prevalence
Language	Not Language-Specific

Relationships

View			Weakness
# ID	View	Status	# ID	Name	Abstraction	Structure	Status
CWE-709	Named Chains	Incomplete	CWE-184	Incomplete List of Disallowed Inputs	Base	Simple	Draft
CWE-1000	Research Concepts	Draft	CWE-184	Incomplete List of Disallowed Inputs	Base	Simple	Draft

Common Attack Pattern Enumeration and Classification (CAPEC)

The Common Attack Pattern Enumeration and Classification (CAPEC™) effort provides a publicly available catalog of common attack patterns that helps users understand how adversaries exploit weaknesses in applications and other cyber-enabled capabilities.

CAPEC at Mitre.org

# ID	Name	Weaknesses
CAPEC-71	Using Unicode Encoding to Bypass Validation Logic	CWE-692
CAPEC-80	Using UTF-8 Encoding to Bypass Validation Logic	CWE-692
CAPEC-85	AJAX Footprinting	CWE-692
CAPEC-120	Double Encoding	CWE-692
CAPEC-267	Leverage Alternate Encoding	CWE-692

CVEs Published

Based on CVE published date

CVSS Severity

CVSS Severity - By Year

CVSS Base Score

# CVE	Description	CVSS	EPSS	EPSS Trend (30 days)	Affected Products	Weaknesses	Security Advisories	Exploits	PoC	Pubblication Date	Modification Date
# CVE	Description	CVSS	EPSS	EPSS Trend (30 days)	Affected Products	Weaknesses	Security Advisories	PoC	Pubblication Date	Modification Date