How to fix CVE-2026-40039?

Within 24 hours: Identify all Pachno 1.0.6 instances in your environment and document their user-facing deployment URLs. Within 7 days: Implement input validation to restrict return_to parameter redirects to approved internal domains only, or disable the return_to functionality entirely if not business-critical. Contact Pachno vendor for patch timeline and subscribe to their security advisory channel. Within 30 days: Upgrade to Pachno 1.0.7 or later when available, or replace with an alternative solution if vendor patch is not released. Conduct security awareness training on phishing risks for all users.

Is Pachno affected by CVE-2026-40039?

Pachno 1.0.6 contains an open redirection vulnerability in the return_to parameter that allows attackers to redirect authenticated users to malicious domains for credential harvesting and phishing attacks.

CVE-2026-40039

EUVD-2026-22043 HIGH

2026-04-13 VulnCheck

GHSA-qx2h-p95p-57w8

Information Disclosure Pachno

7.1

CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Apr 15, 2026 - 12:32 vuln.today

Severity Changed

Apr 13, 2026 - 19:37 NVD

MEDIUM HIGH

CVSS Changed

Apr 13, 2026 - 19:37 NVD

6.5 (MEDIUM) 7.1 (HIGH)

DescriptionNVD

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.

AnalysisAI

Open redirection in Pachno 1.0.6's return_to parameter enables phishing campaigns that harvest user credentials by redirecting victims to attacker-controlled domains after login. With CVSS 7.1 (High) and EPSS 0.03% (9th percentile), exploitation requires user interaction but no authentication, making it effective for social engineering attacks. …

RemediationAI

Within 24 hours: Identify all Pachno 1.0.6 instances in your environment and document their user-facing deployment URLs. Within 7 days: Implement input validation to restrict return_to parameter redirects to approved internal domains only, or disable the return_to functionality entirely if not business-critical. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-40039 vulnerability details – vuln.today

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CVE-2026-40039

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Lifecycle Timeline

DescriptionNVD

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CVE-2026-40039

CVSS VectorNVD

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DescriptionNVD

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External POC / Exploit Code