{"id":"CVE-2026-52881","aliases":["GHSA-vcrw-4xvv-jh49"],"status":"published","title":"MantisBT: Reflected XSS in admin/install.php via unescaped printf","description":"MantisBT 2.28.3 and earlier contains six reflected XSS injection points in `/admin/install.php`. User-supplied parameters are echoed into HTML without escaping via an unescaped printf format string. No authentication is required.\n\nA Content Security Policy (script-src 'self') prevents inline JavaScript execution, but the CSP is missing a form-action directive, allowing exploitation via credential-phishing form injection and \u003cmeta\u003e open redirects.\n\n### Impact\n- Credential phishing: Attacker crafts a URL that renders a fake login form on the real MantisBT admin page. Admin credentials are submitted to an attacker-controlled server.\n- Open redirect: Victim is silently redirected to a phishing or malware site.\n- UI manipulation: CSS injection can hide legitimate page content and overlay attacker-controlled HTML, enabling social engineering.\n\n### Patches\n- https://github.com/mantisbt/mantisbt/commit/297773fbb238c39a153bd888431b41a176132098\n\n### Workarounds\nRemove the `/admin` directory, as [recommended in the Admin Guide](https://mantisbt.org/docs/master/en-US/Admin_Guide/html-desktop/#admin.install.postcommon)\n\n### Resources\n- https://mantisbt.org/bugs/view.php?id=37103\n- related advisory [GHSA-77x8-3v3h-hrhv](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-77x8-3v3h-hrhv)\n\n### Credits\nMcCaulay Hudson (@_McCaulay) of watchTowr","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-07-15T18:34:36Z","modified":"2026-07-15T19:11:50Z","fixes":[{"ecosystem":"Packagist","package":"mantisbt/mantisbt","fixed_in":["2.28.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"mantisbt/mantisbt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.28.3"},{"fixed":"2.28.4"}]}]},{"source":"osv","ecosystem":"Packagist","package":"mantisbt/mantisbt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.28.4"}]}],"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","2.28.2","2.28.3","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"]}],"references":[{"url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-vcrw-4xvv-jh49","tags":["web"]},{"url":"https://github.com/mantisbt/mantisbt/commit/297773fbb238c39a153bd888431b41a176132098","tags":["web"]},{"url":"https://mantisbt.org/bugs/view.php?id=37103","tags":["web"]},{"url":"https://github.com/advisories/GHSA-vcrw-4xvv-jh49"},{"url":"https://github.com/mantisbt/mantisbt","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-vcrw-4xvv-jh49","title":"MantisBT: Reflected XSS in admin/install.php via unescaped printf ","description":"MantisBT 2.28.3 and earlier contains six reflected XSS injection points in `/admin/install.php`. User-supplied parameters are echoed into HTML without escaping via an unescaped printf format string. No authentication is required.\n\nA Content Security Policy (script-src 'self') prevents inline JavaScript execution, but the CSP is missing a form-action directive, allowing exploitation via credential-phishing form injection and \u003cmeta\u003e open redirects.\n\n### Impact\n- Credential phishing: Attacker crafts a URL that renders a fake login form on the real MantisBT admin page. Admin credentials are submitted to an attacker-controlled server.\n- Open redirect: Victim is silently redirected to a phishing or malware site.\n- UI manipulation: CSS injection can hide legitimate page content and overlay attacker-controlled HTML, enabling social engineering.\n\n### Patches\n- https://github.com/mantisbt/mantisbt/commit/297773fbb238c39a153bd888431b41a176132098\n\n### Workarounds\nRemove the `/admin` directory, as [recommended in the Admin Guide](https://mantisbt.org/docs/master/en-US/Admin_Guide/html-desktop/#admin.install.postcommon)\n\n### Resources\n- https://mantisbt.org/bugs/view.php?id=37103\n- related advisory [GHSA-77x8-3v3h-hrhv](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-77x8-3v3h-hrhv)\n\n### Credits\nMcCaulay Hudson (@_McCaulay) of watchTowr","status":"published","published":"2026-07-15T18:34:36Z","modified":"2026-07-15T18:34:37Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:40:43.958448Z"}],"osv":[{"id":"GHSA-vcrw-4xvv-jh49","title":"MantisBT: Reflected XSS in admin/install.php via unescaped printf ","description":"MantisBT 2.28.3 and earlier contains six reflected XSS injection points in `/admin/install.php`. User-supplied parameters are echoed into HTML without escaping via an unescaped printf format string. No authentication is required.\n\nA Content Security Policy (script-src 'self') prevents inline JavaScript execution, but the CSP is missing a form-action directive, allowing exploitation via credential-phishing form injection and \u003cmeta\u003e open redirects.\n\n### Impact\n- Credential phishing: Attacker crafts a URL that renders a fake login form on the real MantisBT admin page. Admin credentials are submitted to an attacker-controlled server.\n- Open redirect: Victim is silently redirected to a phishing or malware site.\n- UI manipulation: CSS injection can hide legitimate page content and overlay attacker-controlled HTML, enabling social engineering.\n\n### Patches\n- https://github.com/mantisbt/mantisbt/commit/297773fbb238c39a153bd888431b41a176132098\n\n### Workarounds\nRemove the `/admin` directory, as [recommended in the Admin Guide](https://mantisbt.org/docs/master/en-US/Admin_Guide/html-desktop/#admin.install.postcommon)\n\n### Resources\n- https://mantisbt.org/bugs/view.php?id=37103\n- related advisory [GHSA-77x8-3v3h-hrhv](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-77x8-3v3h-hrhv)\n\n### Credits\nMcCaulay Hudson (@_McCaulay) of watchTowr","status":"published","published":"2026-07-15T18:34:36Z","modified":"2026-07-15T19:11:50.525745Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:56.981655Z"}]}}