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,
History

Thu, 26 Feb 2026 02:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:monicahq:monica:4.1.2:*:*:*:*:*:*:*

Mon, 23 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-644
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 23 Feb 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Monicahq
Monicahq monica
Vendors & Products Monicahq
Monicahq monica

Fri, 20 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
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,
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-02-20T00:00:00.000Z

Updated: 2026-02-23T20:37:29.313Z

Reserved: 2026-02-16T00:00:00.000Z

Link: CVE-2026-26747

cve-icon Vulnrichment

Updated: 2026-02-23T20:35:16.038Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-20T17:25:56.023

Modified: 2026-02-26T02:42:23.743

Link: CVE-2026-26747

cve-icon Redhat

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