{"id":"CVE-2026-52847","aliases":["GHSA-77x8-3v3h-hrhv"],"title":"MantisBT: Reflected XSS in admin/install.php","summary":"MantisBT: Reflected XSS in admin/install.php","severity":"critical","cwe":["CWE-79"],"vendor":"mantisbt","product":"mantisbt/mantisbt","ecosystem":"composer","affected":["mantisbt/mantisbt <= 2.28.3"],"patched":["mantisbt/mantisbt 2.28.4"],"published":"2026-07-15","updated":"2026-07-15","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-77x8-3v3h-hrhv","references":[{"url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-77x8-3v3h-hrhv"},{"url":"https://github.com/mantisbt/mantisbt/commit/0f32ceabadc745239754962df91a51d5d51e3fd7"},{"url":"https://github.com/mantisbt/mantisbt/commit/f2191a0d8ce438bf74171d496cf721dae025a5c0"},{"url":"https://mantisbt.org/bugs/view.php?id=37103"},{"url":"https://github.com/advisories/GHSA-77x8-3v3h-hrhv"}],"tags":["ghsa","composer"],"ingestedAt":"2026-07-15T18:45:16.872Z","slug":"CVE-2026-52847","body":"## Overview\n\nMantisBT 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 print_test_result(). 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/0f32ceabadc745239754962df91a51d5d51e3fd7\n- https://github.com/mantisbt/mantisbt/commit/f2191a0d8ce438bf74171d496cf721dae025a5c0\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-vcrw-4xvv-jh49](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-vcrw-4xvv-jh49)\n\n### Credits\nMcCaulay Hudson (@_McCaulay) of watchTowr\n\n## Affected packages\n\n- `mantisbt/mantisbt <= 2.28.3`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `mantisbt/mantisbt 2.28.4`","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":52.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}