CVE-2026-26747CRITICAL 9.1EPSS p30.7%

CVE-2026-26747CVE-2026-26747

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,

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.39% probability of exploitation · percentile 30.7% · 2026-06-18T12:00:27Z
Published2026-02-20
Last modified2026-02-26

Underlying weaknesses· 1

CWE-644

References

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

1

TypeTargetConfidenceTier
WeaknessImproper Neutralization of HTTP Headers for Scripting Syntaxcwe-6440%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.