How severe is CVE-2026-4818?

CVE-2026-4818 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-4818 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4818?

CVE-2026-4818 affects Search-guard Flx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4818?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4818 have an EU (EUVD) identifier?

Yes. CVE-2026-4818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17506.

When was CVE-2026-4818 published?

CVE-2026-4818 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-4818

CVE-2026-4818 is a medium-severity vulnerability in Search-guard Flx with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17506
Weakness: CWE-285
Affected product: Search-guard Flx
Published: 2026-03-31
Last modified: 2026-06-17

Description

In Search Guard FLX versions from 3.0.0 up to 4.0.1, there exists an issue which allows users without the necessary privileges to execute some management operations against data streams.

Frequently asked questions

What is CVE-2026-4818?: In Search Guard FLX versions from 3.0.0 up to 4.0.1, there exists an issue which allows users without the necessary privileges to execute some management operations against data streams.
How severe is CVE-2026-4818?: CVE-2026-4818 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-4818 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4818?: CVE-2026-4818 affects Search-guard Flx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4818?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4818 have an EU (EUVD) identifier?: Yes. CVE-2026-4818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17506.
When was CVE-2026-4818 published?: CVE-2026-4818 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:search-guard:flx:*:*:*:*:*:*:*:*

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