{"id":"CVE-2026-52881","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-52881","summary":"MantisBT: Reflected XSS in admin/install.php via unescaped printf ","details":"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 <meta> 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","published":"2026-07-15T18:34:36Z","modified":"2026-07-15T19:01:07.483202123Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","fixedVersion":"2.28.4"}],"fix":{"url":"https://github.com/mantisbt/mantisbt/commit/297773fbb238c39a153bd888431b41a176132098","label":"mantisbt/mantisbt@297773f"},"references":[{"type":"WEB","url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-vcrw-4xvv-jh49"},{"type":"WEB","url":"https://github.com/mantisbt/mantisbt/commit/297773fbb238c39a153bd888431b41a176132098"},{"type":"PACKAGE","url":"https://github.com/mantisbt/mantisbt"},{"type":"WEB","url":"https://mantisbt.org/bugs/view.php?id=37103"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T19:01:07.483202123Z"}}