EUVD-2026-17474
GHSA-mq38-9qw3-63h6
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
In Search Guard FLX up to version 4.0.1, it is possible to use specially crafted requests to redirect the user to an untrusted URL.
AnalysisAI
Open redirect in Search Guard FLX up to version 4.0.1 allows unauthenticated remote attackers to craft malicious requests that redirect users to untrusted URLs, enabling phishing and credential theft attacks. The vulnerability requires user interaction (clicking a redirected link) and affects all versions through 4.0.1. No public exploit code or active exploitation has been confirmed at time of analysis.
Technical ContextAI
Search Guard FLX is a Elasticsearch security plugin developed by floragunn. The vulnerability is a CWE-601 open redirect flaw, which occurs when an application accepts untrusted input (typically a URL parameter) and uses it in a redirect response without proper validation. In this case, specially crafted requests can manipulate the redirect target, causing the user's browser to navigate to an attacker-controlled domain. This is a classic web application vulnerability where insufficient input validation on redirect parameters allows an attacker to abuse the application's redirect functionality for social engineering attacks.
RemediationAI
Upgrade Search Guard FLX to version 4.1.0 or later, which is documented in the official changelog as containing fixes. For organizations unable to upgrade immediately, validate and sanitize all user-supplied input used in redirect operations, implement a whitelist of allowed redirect destinations, and avoid using user input directly in Location headers. Review Search Guard FLX security advisories at https://search-guard.com/cve-advisory/ and consult the changelog at https://docs.search-guard.com/latest/changelog-searchguard-flx-4_1_0 for detailed patch information and deployment guidance.
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