CRITICALCVE-2026-26747Published Modified CNA mitre
CVE-2026-26747: A Host Header Poisoning vulnerability exists in Monica 4
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,
Metrics
- CVSS v3.1
- 9.1
- Severity
- CRITICAL
- Fixed in
- —
- Affected Products
- 1
Affected packages
- n/a / n/an/a
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NReferences