Is CVE-2026-40039 actively exploited?

No active exploitation of CVE-2026-40039 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40039 be exploited remotely?

Yes. CVE-2026-40039 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40039?

CVE-2026-40039 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-40039

CWE-305Published: April 13, 2026· Updated: Apr 17, 2026

6.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.0th

Official Description

Pachno 1.0.6 contains an open redirection vulnerability that allows attackers to redirect users to arbitrary external websites by manipulating the return_to parameter. Attackers can craft malicious login URLs with unvalidated return_to values to conduct phishing attacks and steal user credentials.

NVD Source

Technical Analysis

CVE-2026-40039 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.