The Prototype (prototypejs) framework before 1.5.1 RC3 exchanges data using JavaScript Object Notation (JSON) without an associated protection scheme, which allows remote attackers to obtain the data via a web page that retrieves the data through a URL in the SRC attribute of a SCRIPT element and captures the data using other JavaScript code, aka "JavaScript Hijacking."

FrameWork: XSS Ajax requests (AST-2009-009)

Unspecified vulnerability in Prototype JavaScript framework (prototypejs) before 1.6.0.2 allows attackers to make "cross-site ajax requests" via unknown vectors.

Prototype 1.6.0.1 allows remote authenticated users to forge ticket creation (on behalf of other user accounts) via a modified email ID field.

An issue was discovered in the stripTags and unescapeHTML components in Prototype 1.7.3 where an attacker can cause a Regular Expression Denial of Service (ReDOS) through stripping crafted HTML tags.