What is CVE-2026-40040?

CVE-2026-40040 is a high-severity vulnerability in Pachno, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-04-13.

How severe is CVE-2026-40040?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in Pachno

CVE-2026-40040

Pachno 1.0.6 contains an unrestricted file upload vulnerability that allows authenticated users to upload arbitrary file types by bypassing ineffective extension filtering to the /uploadfile endpoint. Attackers can upload executable files…

Vulnerability class: Unrestricted File Upload

EPSS: 0.001 (31.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Pachno — versions 1.0.6
Pancho Pachno — versions 1.0.6

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

Zero Science Lab Disclosure (third-party-advisory)
VulnCheck Advisory: Pachno 1.0.6 Unrestricted File Upload Remote Code Execution (third-party-advisory)

Frequently asked questions

What is CVE-2026-40040?: CVE-2026-40040 is a high-severity vulnerability in Pachno, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-04-13.
How severe is CVE-2026-40040?: High severity. CVSS v3 base score is 8.8 out of 10.