CVE-2021-33557 MantisBT allows XSS in manage_custom_field_edit_page.php
An attacker can inject malicious scripts via the return parameter in the custom field edit page, potentially leading to session hijacking or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-33557?
CVE-2021-33557 is a medium-severity cross-site scripting vulnerability in Mantisbt Mantisbt, published on 17 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An XSS issue was discovered in manage_custom_field_edit_page.php in MantisBT before 2.25.2. Unescaped output of the return parameter allows an attacker to inject code into a hidden input field.
Weakness: CWE-79
Which versions are affected by CVE-2021-33557?
2 open source packages ship an affected version, including mantisbt/mantisbt. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mantisbt/mantisbt Packagist | All versions | 2.25.2 |
mantisbt/mantisbt Packagist | All versions | 2.25.2 |
Products include Mantisbt Mantisbt.
How do I fix CVE-2021-33557?
Upgrade mantisbt/mantisbt to 2.25.2 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-2021-33557 being exploited?
There is no known exploitation of CVE-2021-33557 in the wild and no public exploit code.
Other vulnerabilities in Mantisbt Mantisbt
- CVE-2019-15074 MantisBT allows cross-site scripting (XSS) via crafted filename
- CVE-2026-30849 MantisBT SOAP API has an authentication bypass vulnerability on MySQL
- CVE-2025-47776 MantisBT: Authentication bypass for some passwords due to PHP type juggling
- CVE-2017-7615 MantisBT allows arbitrary password reset
- CVE-2026-33517 MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation
Sources
Also known as GHSA-52cx-vphc-jmjm.