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Vulnerability record · CVE-2026-50873 · published 15 June 2026

CVE-2026-50873: Unrestricted file upload vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 0.64% · top 51.2% CWE-434 · Unrestricted file upload Deferred
9.8CVSS 3.1 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://gist.github.com/pyuysig/ab0af5b10877fb906941e05a69b202a7
https://gist.github.com/pyuysig/ab0af5b10877fb906941e05a69b202a7

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Source: NIST National Vulnerability Database (record CVE-2026-50873), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.