CVE-2026-26747

9.1 criticalEPSS 0.4%

Critical (9.1) in monicahq monica. EPSS 0.4% chance of exploitation in the next 30 days.

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,

Severity

CVSS 3.1

9.1 critical

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWE: CWE-644
Published: 2026-02-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

monicahq:monica

References

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

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