jsPDF is a library to generate PDFs in JavaScript. Prior to version 4.2.1, user control of the `options` argument of the `output` function allows attackers to inject arbitrary HTML (such as scripts) into the browser context the created PDF is opened in. The vulnerability can be exploited in the following scenario: the attacker provides values for the output options, for example via a web interface. These values are then passed unsanitized (automatically or semi-automatically) to the attack victim. The victim creates and opens a PDF with the attack vector using one of the vulnerable method overloads inside their browser. The attacker can thus inject scripts that run in the victims browser context and can extract or modify secrets from this context. The vulnerability has been fixed in jspdf@4.2.1. As a workaround, sanitize user input before passing it to the output method.
The attacker controls the values of the `options` argument passed to the jsPDF library's `output()` function — for example through a form or other web application interface. These values are then passed without sanitization to the victim, who generates and opens the PDF file in a browser using one of the vulnerable method overloads. Lack of input validation allows embedding malicious HTML or JavaScript code in the PDF file, which is executed in the victim's browser context.
An attacker can execute arbitrary JavaScript code in the victim's browser, enabling theft or modification of sensitive data (e.g., sessions, tokens, form data) accessible in the given browser context.
The jsPDF library should be updated to version 4.2.1 or newer. As a temporary workaround — sanitize user input data before passing it to the output() method.
jsPDF library (Parallax) in versions prior to 4.2.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:LParall Jspdf
APPParall< 4.2.1
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