{"id":"GHSA-73vx-49mv-v8w5","aliases":["CVE-2026-33548"],"title":"MantisBT has Stored HTML Injection/XSS when displaying Tags in Timeline","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"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.\n\n### Impact\nCross-site scripting (XSS).\n\n### Patches\nf32787c14d4518476fe7f05f992dbfe6eaccd815\n\n### Workarounds\n* Edit offending History entries (using SQL)\n* Wrap `$this->tag_name` in a string_html_specialchars() call in IssueTagTimelineEvent::html()\n\n### Credits\nMantisBT thanks Vishal Shukla for discovering and responsibly reporting the issue.","severity":"medium","score":6.1,"published":"2026-03-25T20:09:09.000Z","modified":"2026-03-25T20:26:20.126Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","sources":[{"name":"OSV · GHSA-73vx-49mv-v8w5","url":"https://osv.dev/vulnerability/GHSA-73vx-49mv-v8w5"}],"ranges":[{"events":[{"introduced":"2.28.0"},{"fixed":"2.28.2"}],"type":"ECOSYSTEM"}],"versions":["2.28.0","2.28.1"],"fixed":["2.28.2"]}],"sourceAffected":[],"references":["https://github.com/mantisbt/mantisbt/security/advisories/GHSA-73vx-49mv-v8w5","https://nvd.nist.gov/vuln/detail/CVE-2026-33548","https://github.com/mantisbt/mantisbt/commit/f32787c14d4518476fe7f05f992dbfe6eaccd815","https://github.com/mantisbt/mantisbt","https://mantisbt.org/bugs/view.php?id=36973"],"sources":[{"name":"OSV","id":"GHSA-73vx-49mv-v8w5","modified":"2026-03-25T20:26:20.126114Z","url":"https://osv.dev/vulnerability/GHSA-73vx-49mv-v8w5"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},{"source":"OSV","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","score":8.6}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T21:55:33.923Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}