{"id":"CVE-2026-26747","details":"A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP Host header in app/Providers/AppServiceProvider.php, combined with the default misconfiguration where the \"app.force_url\" is not set and default is \"false\". The application generates absolute URLs (such as those used in password reset emails) using the user-supplied Host header. This allows remote attackers to poison the password reset link sent to a victim,","modified":"2026-08-12T03:51:44.551665002Z","published":"2026-02-20T00:00:00Z","database_specific":{"cna_assigner":"mitre","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26747.json"},"references":[{"type":"WEB","url":"https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26747.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26747"},{"type":"PACKAGE","url":"https://github.com/monicahq/monica"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/monicahq/monica","events":[{"introduced":"32028ce3ce79cef38df5d27a297e5b20680f0065"},{"last_affected":"32028ce3ce79cef38df5d27a297e5b20680f0065"}],"database_specific":{"extracted_events":[{"introduced":"4.1.2"},{"last_affected":"4.1.2"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:monicahq:monica:4.1.2:*:*:*:*:*:*:*"}}],"versions":["4.1.2","v4.1.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26747.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}