Org.keycloak.authentication: two factor authentication bypass

published 2025-04-29 18 mo ago modified 2026-09-21 49 d ago also BIT-keycloak-2025-3910 , EUVD-2025-12659 , GHSA-5jfq-x6xp-7rw2

cvss: 5.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits: 0; none known

A flaw was found in Keycloak. The org.keycloak.authorization package may be vulnerable to circumventing required actions, allowing users to circumvent requirements such as setting up two-factor authentication.

Patch / fix

fixed in 3

maven org.keycloak:keycloak-services 26.2.2
bitnami keycloak 26.0.11
Red Hat Red Hat build of Keycloak 26.0 26.0-12, 26.0-13, 26.0.11-2

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-2025-3910 updated 2026-09-21 cvss 5.4

org.keycloak.authentication: Two factor authentication bypass

Red Hat Build of Keycloak
fixed: vendor fix “No current mitigations are available for this vulnerability.” RHSA-2025:4336
Red Hat build of Keycloak 26.0 rhbk/keycloak-rhel9 26.0-1745967474, rhbk/keycloak-operator-bundle 26.0.11-2, rhbk/keycloak-rhel9-operator 26.0-1745967472
fixed: vendor fix “No current mitigations are available for this vulnerability.” RHSA-2025:4335

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

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-30)

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
GitHub	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
OSV	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.keycloak:keycloak-services	<26.2.2	26.2.2
bitnami	keycloak	>=26.0.0, <26.0.11	26.0.11

Affected products

Red Hat Red Hat Build of Keycloak
Red Hat Red Hat build of Keycloak 26.0

Classification

Weakness

CWE-287 Improper Authentication

References

access.redhat.com /errata/RHSA-2025:4335
vendor-advisory, web, advisory
access.redhat.com /errata/RHSA-2025:4336
vendor-advisory, web, advisory
access.redhat.com /security/cve/CVE-2025-3910
vdb-entry, web, vendor-advisory, advisory
bugzilla.redhat.com /show_bug.cgi?id=2361923
issue-tracking, web, vendor-advisory, advisory
github.com /keycloak/keycloak/issues/39349
web, issue-tracking, report
github.com /keycloak/keycloak/security/advisories/GHSA-5jfq-x6xp-7rw2
web
nvd.nist.gov /vuln/detail/CVE-2025-3910
advisory, 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