CVE-2026-26747 | THREATINT

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,

PUBLISHED Reserved 2026-02-16 | Published 2026-02-20 | Updated 2026-02-23 | Assigner mitre

References

github.com/monicahq/monica

github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md

cve.org (CVE-2026-26747)

nvd.nist.gov (CVE-2026-26747)

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