{"id":"GHSA-fvjf-68wh-rwp2","aliases":["CVE-2026-34463"],"title":"MantisBT is Vulnerable to Stored HTML Injection/XSS in Clone Issue Form","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"When cloning an issue originating from a Project other than the current one, the clone form (bug_report_page.php) prepends the source Project name before the category selector without proper escaping, allowing an attacker able to to inject HTML if they can set the Project's name (which typically requires *manager* or *administrator* access level).\n\n\n### Impact\nCross-site scripting (XSS).\nThis is mitigated by Content Security Policy which restricts scripts execution.\n\n### Patches\n- df22697ae497ddd93f3d9132fdf4979db8d081cd\n\n### Workarounds\nMake sure Project names do not contain any HTML tags.\n\n### Credits\nThanks to Vishal Shukla for discovering and responsibly reporting the issue.\n\nThe vulnerability was also identified and independently reported by @siunam321 (Tang Cheuk Hei), prior to this Advisory's publication.","severity":"high","score":8.6,"published":"2026-05-11T19:32:11.000Z","modified":"2026-09-10T03:51:05.552Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","sources":[{"name":"OSV · GHSA-fvjf-68wh-rwp2","url":"https://osv.dev/vulnerability/GHSA-fvjf-68wh-rwp2"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"2.28.2"}],"type":"ECOSYSTEM"}],"versions":["2.10.0","2.10.1","2.11.0","2.11.1","2.12.0","2.12.1","2.12.2","2.13.0","2.13.1","2.13.2","2.14.0","2.15.0","2.15.1","2.16.0","2.16.1","2.17.0","2.17.1","2.17.2","2.18.0","2.18.1","2.19.0","2.19.1","2.20.0","2.20.1","2.21.0","2.21.1","2.21.2","2.21.3","2.22.0","2.22.1","2.22.2","2.23.0","2.23.1","2.24.0","2.24.1","2.24.2","2.24.3","2.24.4","2.24.5","2.25.0","2.25.1","2.25.2","2.25.3","2.25.4","2.25.5","2.25.6","2.25.7","2.25.8","2.26.0","2.26.1","2.26.2","2.26.3","2.26.4","2.27.0","2.27.1","2.27.2","2.27.3","2.28.0","2.28.1","2.3.0","2.3.1","2.3.2","2.3.3","2.4.0","2.4.1","2.4.2","2.5.0","2.5.1","2.5.2","2.6.0","2.7.0","2.7.1","2.8.0","2.8.1","2.9.0","2.9.1"],"fixed":["2.28.2"]}],"sourceAffected":[],"references":["https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2","https://nvd.nist.gov/vuln/detail/CVE-2026-34463","https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd","https://github.com/mantisbt/mantisbt","https://mantisbt.org/bugs/view.php?id=36986"],"sources":[{"name":"OSV","id":"GHSA-fvjf-68wh-rwp2","modified":"2026-09-10T03:51:05.552621253Z","url":"https://osv.dev/vulnerability/GHSA-fvjf-68wh-rwp2"}],"assessments":[{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.6}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T23:50:31.598Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}