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

March 25, 2026

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.

References

github.com/advisories/GHSA-73vx-49mv-v8w5
github.com/mantisbt/mantisbt
github.com/mantisbt/mantisbt/commit/f32787c14d4518476fe7f05f992dbfe6eaccd815
github.com/mantisbt/mantisbt/security/advisories/GHSA-73vx-49mv-v8w5
mantisbt.org/bugs/view.php?id=36973
nvd.nist.gov/vuln/detail/CVE-2026-33548

Code Behaviors & Features

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