CVE-2026-26747: 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…

PriorityP357critical9.1CVSS 3.1

AVNACLPRNUINSUCHIHAN

EPSS

0.39%

30.9th percentile

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,

Affected

1 ranges

Vendor	Product	Version range	Fixed in
monicahq	monica	—	—

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