{"id":"CVE-2026-26747","aliases":["EUVD-2026-7493","GHSA-xf4f-qj26-72pf"],"status":"published","title":"A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP...","description":"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,","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00444,"percentile":0.38956,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-644"],"published":"2026-02-20T00:00:00Z","modified":"2026-10-28T02:31:05Z","products":[{"vendor":"monicahq","product":"monica"}],"references":[{"url":"https://github.com/monicahq/monica","tags":["Product","package"]},{"url":"https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md","tags":["Exploit","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26747","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xf4f-qj26-72pf"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26747.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-26747","description":"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,","status":"published","published":"2026-02-20T00:00:00Z","modified":"2026-02-23T20:37:29.313Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp"}],"cwes":["CWE-644"],"updated_at":"2026-11-02T13:38:20.971157Z"}],"euvd":[{"id":"EUVD-2026-7493","description":"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,","status":"published","published":"2026-02-20T00:00:00Z","modified":"2026-02-23T20:37:29Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T19:48:32.158773Z"}],"ghsa":[{"id":"GHSA-xf4f-qj26-72pf","title":"A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP...","description":"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,","status":"published","published":"2026-02-20T18:31:39Z","modified":"2026-02-23T21:31:26Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-644"],"updated_at":"2026-11-02T15:06:20.459119Z"}],"nvd":[{"id":"CVE-2026-26747","description":"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,","status":"published","published":"2026-02-20T17:25:56.023Z","modified":"2026-06-17T10:26:19.603Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-644"],"updated_at":"2026-11-02T14:12:06.63895Z"}],"osv":[{"id":"CVE-2026-26747","description":"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,","status":"published","published":"2026-02-20T00:00:00Z","modified":"2026-10-28T02:31:05.98343151Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:44:59.80315Z"}]}}