What is CVE-2026-50873?

CVE-2026-50873 is a critical-severity vulnerability in N/a, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-06-15.

How severe is CVE-2026-50873?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in N/a

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 crafted HTML or SVG file.

Vulnerability class: Unrestricted File Upload

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-50873?: CVE-2026-50873 is a critical-severity vulnerability in N/a, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-06-15.
How severe is CVE-2026-50873?: Critical severity. CVSS v3 base score is 9.8 out of 10.