CVE-2026-33517
March 23, 2026
Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder "%1$s" from "$s_tag_delete_message" string.
Affected Packages
https://github.com/mantisbt/mantisbt.git (GITHUB):
Affected version(s) =release-2.28.0 <release-2.28.1Fix Suggestion:
Update to version release-2.28.1https://github.com/mantisbt/mantisbt.git (GITHUB):
Affected version(s) =release-2.28.0 <release-2.28.1Fix Suggestion:
Update to version release-2.28.1https://github.com/mantisbt/mantisbt.git (GITHUB):
Affected version(s) =release-2.28.0 <release-2.28.1Fix Suggestion:
Update to version release-2.28.1mantisbt/mantisbt (PHP):
Affected version(s) =2.28.0 <2.28.1Fix Suggestion:
Update to version 2.28.1mantisbt/mantisbt (PHP):
Affected version(s) =2.28.0 <2.28.1Fix Suggestion:
Update to version 2.28.1mantisbt/mantisbt (PHP):
Affected version(s) =2.28.0 <2.28.1Fix Suggestion:
Update to version 2.28.1mantisbt/mantisbt (PHP):
Affected version(s) =2.28.0 <2.28.1Fix Suggestion:
Update to version 2.28.1Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.04
