CVE-2023-33962 JStachio XSS vulnerability: Unescaped single quotes
Attackers can inject malicious JavaScript via unescaped single quotes in JStachio templates, leading to session hijacking or data theft.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-33962?
CVE-2023-33962 is a medium-severity cross-site scripting vulnerability in jstachio, published on 30 May 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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 `'`. As a workaround, users can avoid this issue by using only double quotes `"` for HTML attributes.
Weakness: CWE-79
Which versions are affected by CVE-2023-33962?
2 open source packages ship an affected version, including io.jstach:jstachio. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.jstach:jstachio Maven | All versions | 1.0.1 |
io.jstach:jstachio Maven | All versions | 1.0.1 |
Products include Jstachio Project Jstachio.
How do I fix CVE-2023-33962?
Upgrade io.jstach:jstachio to 1.0.1 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-33962 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-33962 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-gwxv-jv83-6qjr.