What’s Vulnerable › Vulnerabilities

CVE-2021-33557

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-17 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• mantisbt: before 2.25.2 — fixed in 2.25.2

How to fix

Upgrade to a fixed version: mantisbt 2.25.2. Check the vendor advisory for mitigations.

References

• https://mantisbt.org/blog/archives/mantisbt/699
• https://mantisbt.org/bugs/view.php?id=28552
• https://mantisbt.org/blog/archives/mantisbt/699
• https://mantisbt.org/bugs/view.php?id=28552

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