CVE-2026-50873

Published Jun 15, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Flatnotes
Flatnotes flatnotes
Vendors & Products Flatnotes
Flatnotes flatnotes
Type Values Removed Values Added
Title Arbitrary File Upload Enabling Remote Code Execution in Flatnotes v5.5.4
Type Values Removed Values Added
Title Arbitrary File Upload Enabling Remote Code Execution in Flatnotes v5.5.4
Type Values Removed Values Added
Weaknesses CWE-434
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jun 16, 2026, 1:06 PM
Reserved
Jun 7, 2026, 12:00 AM
Status
Deferred
Published
Jun 15, 2026, 8:16 PM
Modified
Jun 17, 2026, 10:57 AM