CVE-2026-33548

MEDIUM

MantisBT has Stored HTML Injection / XSS when displaying Tags in Timeline

Title source: cna
STIX 2.1

Description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, improper escaping of tag names retrieved from History in Timeline (my_view_page.php) allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript, when displaying a tag that has been renamed or deleted. Version 2.28.1 contains a patch. Workarounds include editing offending History entries (using SQL) and wrapping `$this->tag_name` in a string_html_specialchars() call in IssueTagTimelineEvent::html().

References (2)

Scores

CVSS v3 6.1
EPSS 0.0004
EPSS Percentile 11.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-79
Status published
Products (3)
mantisbt/mantisbt 2.28.0
mantisbt/mantisbt = 2.28.0
mantisbt/mantisbt 2.28.0 - 2.28.2Packagist
Published Mar 23, 2026
Tracked Since Mar 24, 2026