CVE-2018-20698: The floragunn Search Guard plugin before 6.x-16 for Kibana allows URL injection for login redirects on the log

Q: How do I fix CVE-2018-20698?

search guard: upgrade to 6.3.0-16. Exact commands for each OS are on this page.

Q: Is CVE-2018-20698 being exploited?

CVE-2018-20698 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-20698 affect?

CVE-2018-20698 affects search guard. Severity is medium (CVSS 6.1). The floragunn Search Guard plugin before 6.x-16 for Kibana allows URL injection for login redirects on the login page when basePath is set.

Q: How urgent is CVE-2018-20698?

Priority 36/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2018-20698 is a medium-severity flaw (CVSS 6.1) affecting search guard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The floragunn Search Guard plugin before 6.x-16 for Kibana allows URL injection for login redirects on the login page when basePath is set.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-601
Published	2019-04-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: search-guard

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-04-09 18:29 UTCPublished CVE record published
2026-06-17 01:53 UTCUpdated Record last modified

search-guard search guard UPGRADE

Affected: < 6.3.0-16

Fixed in: 6.3.0-16

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy search-guard || rpm -q search-guard || search-guard --version

2. UPGRADE to 6.3.0-16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade search-guard

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade search-guard

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-20698?

search guard: upgrade to 6.3.0-16. Exact commands for each OS are on this page.

Is CVE-2018-20698 being exploited?

CVE-2018-20698 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-20698 affect?

CVE-2018-20698 affects search guard. Severity is medium (CVSS 6.1). The floragunn Search Guard plugin before 6.x-16 for Kibana allows URL injection for login redirects on the login page when basePath is set.

How urgent is CVE-2018-20698?

Priority 36/100. No elevated risk signals yet.

Software pages

Kibana vulnerabilities

Related CVEs

CVE-2019-13423 HIGH 8.8 UPGRADE Search Guard Kibana Plugin versions before 5.6.8-7 and before 6.x.y-12 had an issue that an authenticated Kiba
CVE-2019-13422 MEDIUM 6.1 UPGRADE Search Guard Kibana Plugin versions before 5.6.8-7 and before 6.x.y-12 had an issue that an attacker can redir
CVE-2019-13421 MEDIUM 4.9 UPGRADE Search Guard versions before 23.1 had an issue that an administrative user is able to retrieve bcrypt password
CVE-2019-13420 MEDIUM 5.9 UPGRADE Search Guard versions before 21.0 had an timing side channel issue when using the internal user database.
CVE-2019-13419 HIGH 7.5 UPGRADE Search Guard versions before 23.1 had an issue that for aggregations clear text values of anonymised fields we

References

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