CVE-2026-2603

highpriority · track · 0OT risk · elevatedEPSS 0.004 · 38 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.44% (38th) EPSS

CVSS 8.1 · high

Is it mine?

12 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · secalert@redhat.com USexploitability 2.8 · impact 5.2

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondaryexploitability 2.8 · impact 5.2

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · OSV

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-306USCWE-306US

affected products (12)

Products and version ranges known to be affected.

Open Source Keycloak <26.5.5all versionscert_bundDE
Open Source Keycloak< 26.5.5cert_bundDE
Red Hat Red Hat build of Keycloak 26.2< 26.2-16enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.2< 26.2.14-1enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.4< 26.4-12enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.4< 26.4.10-1enisa_euvdEU
redhat build of keycloak26.2 → 26.2.14nvdUScpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
redhat build of keycloak26.4 → 26.4.10nvdUScpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
Bitnami keycloak26.2.0 → 26.2.14osvUSpkg:bitnami/keycloak
Bitnami keycloak26.4.0 → 26.4.10osvUSpkg:bitnami/keycloak
Maven org.keycloak:keycloak-server-spi-private< 26.5.5osvUSpkg:maven/org.keycloak/keycloak-server-spi-private
Maven org.keycloak:keycloak-services< 26.5.5osvUSpkg:maven/org.keycloak/keycloak-services

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0622Keycloak: Mehrere Schwachstellen ermöglichen Umgehen von SicherheitsvorkehrungenDeutsch2026-03-05csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
GHSA-x4p7-7chp-64hqKeycloak: Unauthorized authentication via disabled SAML Identity Provider2026-03-18ghsa · osvUS
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.
BIT-keycloak-2026-2603Keycloak: keycloak: unauthorized authentication via disabled saml identity provider2026-08-25vendor · osvUS
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.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund nvd NVD CVE.org MITRE

published 2026-03-18modified 2026-08-18

references (20)

External citations — patches, advisories, analysis.

scry

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