CWE-86 - Improper Neutralization of Invalid Characters in Identifiers in Web Pages

Weakness Name

Improper Neutralization of Invalid Characters in Identifiers in Web Pages

Description

The product does not neutralize or incorrectly neutralizes invalid characters or byte sequences in the middle of tag names, URI schemes, and other identifiers.

Some web browsers may remove these sequences, resulting in output that may have unintended control implications. For example, the product may attempt to remove a "javascript:" URI scheme, but a "java%00script:" URI may bypass this check and still be rendered as active javascript by some browsers, allowing XSS or other attacks.

Common Consequences

Related Weaknesses

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')High

CWE-184Incomplete List of Disallowed Inputs

CWE-436Interpretation Conflict