Keycloak Authentication Error

published 2019-12-05 6 y ago modified 2026-06-17 4 mo ago also GHSA-jf86-9434-f8c2 , EUVD-2022-4341

cvss: 9.3; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

A vulnerability was found in keycloak 7.x, when keycloak is configured with LDAP user federation and StartTLS is used instead of SSL/TLS from the LDAP server (ldaps), in this case user authentication succeeds even if invalid password has entered.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-14910 updated 2026-02-20 cvss 9.3

Keycloak: LDAP authentication accepts invalid passwords when using StartTLS

Red Hat Single Sign-On 7 rh-sso7-keycloak rh-sso7-keycloak
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.05% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	9.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.keycloak:keycloak-parent	>=7.0.0, <=7.0.1	no fix listed

Affected products

n/a Keycloak

Classification

Weakness

CWE-287 Improper Authentication
CWE-305 Authentication Bypass by Primary Weakness
CWE-592 DEPRECATED: Authentication Bypass Issues
CWE-295 Improper Certificate Validation
CWE-278 Insecure Preserved Inherited Permissions

References

bugzilla.redhat.com /show_bug.cgi?id=CVE-2019-14910
web, issue-tracking, mitigation, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2019-14910
advisory
access.redhat.com /security/cve/cve-2019-14910
web
github.com /keycloak/keycloak
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary