CVE-2026-26747

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.1 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N                                    

Vulnerability 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,

Vulnerability Details

Published Date

February 20, 2026

Last Modified

February 26, 2026

CWE ID

CWE-644

Source

NVD

Vendor

monicahq

Product

monica

External References

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

CVE-2026-26747

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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