Skip to content
OpenAdvisories
Medium · 5.4 Public exploit CVE-2023-33962 EUVD-2023-1810GHSA-gwxv-jv83-6qjr

JStachio XSS vulnerability: Unescaped single quotes

Published May 30, 2023 · Updated Jan 10, 2025 · Assigned by GitHub_M

Vendor: jstachio Product: jstachio Package: io.jstach:jstachio Ecosystem: Maven

Description

JStachio is a type-safe Java Mustache templating engine. Prior to version 1.0.1, JStachio fails to escape single quotes `'` in HTML, allowing an attacker to inject malicious code. This vulnerability can be exploited by an attacker to execute arbitrary JavaScript code in the context of other users visiting pages that use this template engine. This can lead to various consequences, including session hijacking, defacement of web pages, theft of sensitive information, or even the propagation of malware.

Version 1.0.1 contains a patch for this issue. To mitigate this vulnerability, the template engine should properly escape special characters, including single quotes. Common practice is to escape `'` as `&#39`. As a workaround, users can avoid this issue by using only double quotes `"` for HTML attributes.

Affected products

VendorProductAffectedFixed
jstachio jstachio < 1.0.1 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Maven io.jstach:jstachio < 1.0.1 1.0.1 GHSA-gwxv-jv83-6qjr

References