CVE-2026-26747
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
20/02/2026
Last modified:
20/02/2026
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,