What is CVE-2026-4799?

CVE-2026-4799 is a medium-severity vulnerability in Floragunn Search Guard Flx, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-03-31.

How severe is CVE-2026-4799?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Open Redirect in Floragunn Search Guard Flx

CVE-2026-4799

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.

Vulnerability class: Open Redirect

Published 2026-03-31 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Floragunn Search Guard Flx — versions 1.0.0
Search-Guard Flx

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

search-guard.com/cve-advisory/ (Vendor Advisory)
docs.search-guard.com/latest/changelog-searchguard-flx-4_1_0 (Release Notes)

Frequently asked questions

What is CVE-2026-4799?: CVE-2026-4799 is a medium-severity vulnerability in Floragunn Search Guard Flx, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-03-31.
How severe is CVE-2026-4799?: Medium severity. CVSS v3 base score is 4.3 out of 10.