{"id":"GHSA-4v8w-gg5j-ph37","aliases":["CVE-2025-47776"],"title":"MantisBT vulnerable to authentication bypass for some passwords due to PHP type juggling","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"Due to an incorrect use of loose (`==`) instead of strict (`===`) comparison in the [authentication code][1], PHP type juggling will cause interpretation of certain MD5 hashes as numbers, specifically those matching scientific notation.\n\n[1]: https://github.com/mantisbt/mantisbt/blob/0fb502dd613991e892ed2224ac5ea3e40ba632bc/core/authentication_api.php#L782\n\n### Impact\nOn MantisBT instances configured to use the *MD5* login method, user accounts having a password hash evaluating to zero (i.e. matching regex `^0+[Ee][0-9]+$`) are vulnerable, allowing an attacker knowing the victim's username to login without knowledge of their actual password, using any other password having a  hash evaluating to zero, for example `comito5` (0e579603064547166083907005281618). \n\nNo password bruteforcing for individual users is needed, thus $g_max_failed_login_count does not protect against the attack.\n\n### Patches\n* https://github.com/mantisbt/mantisbt/commit/966554a19cf1bdbcfbfb3004766979faa748f9a2\n\n### Workarounds\nCheck the database for vulnerable accounts, and change those users' passwords, e.g. for MySQL:\n```sql\nSELECT username, email FROM mantis_user_table WHERE password REGEXP '^0+[Ee][0-9]+$'\n```\n\n### References\n- https://mantisbt.org/bugs/view.php?id=35967\n\n### Credits\nThanks to Harry Sintonen / Reversec for discovering and reporting the issue.","severity":"critical","score":9.1,"published":"2025-11-03T17:07:36.000Z","modified":"2026-03-06T00:32:33.168Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","sources":[{"name":"OSV · GHSA-4v8w-gg5j-ph37","url":"https://osv.dev/vulnerability/GHSA-4v8w-gg5j-ph37"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"2.27.2"}],"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","2.3.0","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":["2.27.2"]}],"sourceAffected":[],"references":["https://github.com/mantisbt/mantisbt/security/advisories/GHSA-4v8w-gg5j-ph37","https://nvd.nist.gov/vuln/detail/CVE-2025-47776","https://github.com/mantisbt/mantisbt/commit/966554a19cf1bdbcfbfb3004766979faa748f9a2","https://github.com/mantisbt/mantisbt","https://github.com/mantisbt/mantisbt/blob/0fb502dd613991e892ed2224ac5ea3e40ba632bc/core/authentication_api.php#L782","https://mantisbt.org/bugs/view.php?id=35967"],"sources":[{"name":"OSV","id":"GHSA-4v8w-gg5j-ph37","modified":"2026-03-06T00:32:33.168285Z","url":"https://osv.dev/vulnerability/GHSA-4v8w-gg5j-ph37"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.8}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T21:55:33.923Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}