CVE-2026-50873

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

Critical · published June 15, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
50.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00643 · 50.2th percentile
Published
2026-06-15T00:00Z
EPSS history
Timeline
  • 15 JUN 00:00Z
    An arbitrary file upload vulnerability in the attachment handling component of flatnotes v5.5.4 allows attackers to execute arbitrary code via uploading a…
    cvelistv5