CVE-2026-33517 | THREATINT

Description

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.

PUBLISHED Reserved 2026-03-20 | Published 2026-03-23 | Updated 2026-03-24 | Assigner GitHub_M

HIGH: 8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

= 2.28.0

affected

References

github.com/...ntisbt/security/advisories/GHSA-fh48-f69w-7vmp

github.com/...ommit/80990f43153167c73f11eb4b2bc7108d0c3d6b46

github.com/...ommit/d6890320752ecf37bd74d11fe14fe7dc12335be9

cve.org (CVE-2026-33517)

nvd.nist.gov (CVE-2026-33517)

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