What is CVE-2026-4819?

CVE-2026-4819 is a medium-severity vulnerability in Floragunn Search Guard Flx, classified under Insufficiently Protected Credentials. CVSS score: 4.9/10. Published 2026-03-31.

How severe is CVE-2026-4819?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Information disclosure in Floragunn Search Guard Flx

CVE-2026-4819

In Search Guard FLX versions from 1.0.0 up to 4.0.1, the audit logging feature might log user credentials from users logging into Kibana.

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

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.1% 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: 0.004 · change: +0.001

Affected products

Floragunn Search Guard Flx — versions 1.0.0
Search-Guard Flx

Weakness classification (CWE)

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-2026-4819?: CVE-2026-4819 is a medium-severity vulnerability in Floragunn Search Guard Flx, classified under Insufficiently Protected Credentials. CVSS score: 4.9/10. Published 2026-03-31.
How severe is CVE-2026-4819?: Medium severity. CVSS v3 base score is 4.9 out of 10.