CVE-2026-50873

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CVSS 3.1

9.8 critical

EPSS

<1%p37

Published

Jun 15, 2026 (Jun 15, 2026)

Modified

Jun 17, 2026

Description

An arbitrary file upload vulnerability in the attachment handling component of flatnotes v5.5.4 allows attackers to execute arbitrary code via uploading a crafted HTML or SVG file.

Weakness: CWE-434
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.4%)

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