Detections
Analytics
CVE-2026-26747
high
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
https://github.com/monicahq/monica
https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md