Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-2603

Keycloak: Unauthorized authentication via disabled SAML Identity Provider
Back to all
CVE

CVE-2026-2603

Keycloak: Unauthorized authentication via disabled SAML Identity Provider

A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
C
H
U
8.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-2603, https://github.com/keycloak/keycloak/issues/46911, https://github.com/keycloak/keycloak/pull/46932, https://github.com/keycloak/keycloak/commit/4fd5367e6cc28cfa68fb2240fc459c12b1fdbf2a, https://github.com/keycloak/keycloak/commit/8ed7e59dc08d79751a27c23aadb590f06b43f132, https://access.redhat.com/errata/RHSA-2026:3925, https://access.redhat.com/errata/RHSA-2026:3926, https://access.redhat.com/errata/RHSA-2026:3947, https://access.redhat.com/errata/RHSA-2026:3948, https://access.redhat.com/security/cve/CVE-2026-2603, https://bugzilla.redhat.com/show_bug.cgi?id=2440300, https://github.com/keycloak/keycloak, https://github.com/keycloak/keycloak/commits/26.5.5

Severity

8.1

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.1
EPSS Probability
0.00192%
EPSS Percentile
0.40807%
Introduced Version
26.5.0,26.0.0,25.0.0,22.0.0,25.0.3,12.0.0,3.4.2.Final,3.2.0.CR1,3.0.0.CR1,1.7.0.CR1,1.2.0.Beta1,26.3.0,2.4.0.CR1,1.9.0.CR1,1.2.0.CR1,20.0.0
Fix Available
26.5.5,2.4.0.CR1,21.0.0

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading