Is CVE-2026-40040 actively exploited?

No active exploitation of CVE-2026-40040 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40040 be exploited remotely?

Yes. CVE-2026-40040 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40040?

CVE-2026-40040 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-40040

CWE-434Published: April 13, 2026· Updated: Apr 17, 2026

8.8

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:27.5th

Official Description

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 .php5 scripts to web-accessible directories and execute them to achieve remote code execution on the server.

NVD Source

Technical Analysis

CVE-2026-40040 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.