CVE-2026-33548 HIGH

CVE-2026-33548: MantisBT has Stored HTML Injection / XSS when displaying Tags in Timeline

Vendor Mantisbt
Product mantisbt
Weakness CWE-79 · XSS
Published March 23, 2026
Last update March 24, 2026
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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().

Key dates

02Disclosure timeline

March 23, 2026 CVE published
March 24, 2026 Record updated

Related vulnerabilities

04Related CVE

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