VULNERABILITY INTELLIGENCE

CVE-2026-26747

CVSS score9.1 CRITICAL
EPSS probability0.44%
CISA KEVNot currently listed
Published2026-02-20
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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,

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-644

Primary references