Medium severity6.5NVD Advisory· Published Apr 13, 2026· Updated Apr 17, 2026

CVE-2026-40039

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

RubyGems/Pachnollm-fuzzy
Range: = 1.0.6
Package: https://rubygems.org/gems/pachno

Patches

Vulnerability mechanics

References

www.vulncheck.com/advisories/pachno-open-redirection-via-return-to-parameternvd
www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5981.phpnvd

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