CVE-2026-26747

CRITICAL

9.1

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,

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/20/2026

Last Modified2/26/2026

Sourcenvd

Honeypot Sightings0

Affected Products

monicahq:monica

Weaknesses (CWE)

CWE-644

References

https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md(cve@mitre.org)

https://github.com/monicahq/monica(cve@mitre.org)

IOC Correlations

No correlations recorded

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