CVE-2026-26747

Published February 20th, 2026

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CVSS v3

9.1

CRITICAL

CVSS v2

N/A

Affected

PROJECTS

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,

monicahq/monica

Personal CRM. Remember everything about your friends, family and business relationships.

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hungnqdz/cve-research

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