{"id":"CVE-2026-34463","aliases":["GHSA-fvjf-68wh-rwp2"],"url":"https://o3.security/vulnerability/CVE-2026-34463","summary":"MantisBT has Stored HTML Injection/XSS via Clone Issue Form","details":"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.","published":"2026-05-19T21:57:49.015Z","modified":"2026-08-12T03:51:14.908526249Z","cvss":null,"epss":{"score":0.00444,"percentile":0.37781,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","fixedVersion":"2.28.2"}],"fix":{"url":"https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd","label":"mantisbt/mantisbt@df22697"},"references":[{"type":"WEB","url":"https://mantisbt.org/bugs/view.php?id=36986"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34463.json"},{"type":"ADVISORY","url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34463"},{"type":"FIX","url":"https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd"},{"type":"PACKAGE","url":"https://github.com/mantisbt/mantisbt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:14.908526249Z"}}