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Vulnerability record · CVE-2021-33557 · published 17 June 2021

CVE-2021-33557: Mantisbt cross-site scripting vulnerability

Mantisbt · Mantisbt

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.

6.1 CVSS 3.1 Medium EPSS 1.8% · top 22.0% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://mantisbt.org/blog/archives/mantisbt/699 Release NotesVendor Advisory
https://mantisbt.org/bugs/view.php?id=28552 ExploitVendor Advisory
https://mantisbt.org/blog/archives/mantisbt/699 Release NotesVendor Advisory
https://mantisbt.org/bugs/view.php?id=28552 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-33557), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.