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TI-2026-13740 Aliases CVE-2026-16442GHSA-vj6m-hv26-qx79

Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction

Priority MEDIUM 42CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-346.

Summary

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00313 24th percentileScored 2026-11-07
Fix Fixed Red Hat: 4 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat build of Keycloak 26.4—26.4.14-1Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-22Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-22Patch availableCNA
Red HatRed Hat build of Keycloak 26.4.14——Not affectedCNA
Red HatRed Hat build of Keycloak 26.4.14——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6—26.6.5-1Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-11Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-11Patch availableCNA
Red HatRed Hat build of Keycloak 26.6.5——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6.5——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6.5——Not affectedCNA
Red HatRed Hat Data Grid 8——Not affectedCNA
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack——Not affectedCNA
Red HatRed Hat Single Sign-On 7——Not affectedCNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4.14-1 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-22 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-22 Patch available CNA
  • Red Hat build of Keycloak 26.4.14 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.4.14 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6.5-1 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-11 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-11 Patch available CNA
  • Red Hat build of Keycloak 26.6.5 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6.5 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6.5 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Data Grid 8 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat JBoss Enterprise Application Platform Expansion Pack VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — Not affected CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*26.4 to before 26.4.14; 26.6 to before 26.6.5VulnerableRed Hat
  • cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:* Versions 26.4 to before 26.4.14; 26.6 to before 26.6.5 Vulnerable ·Red Hat

Remediation

Red Hat 4 advisories

  • RHSA-2026:50849 Released 2026-08-05 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.5 Images Security Update
    • Red Hat build of Keycloak 26.6 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:50847 Released 2026-08-05 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.14 Images Security Update
    • Red Hat build of Keycloak 26.4 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:50846 Released 2026-08-05 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.14 Security Update
    • Red Hat build of Keycloak 26.4.14
Show 1 more Red Hat advisories
  • RHSA-2026:50848 Released 2026-08-05 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.5 Security Update
    • Red Hat build of Keycloak 26.6.5

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat build of Keycloak 26.4Fixed RHSA-2026:50847
Red Hat build of Keycloak 26.4.14Fixed RHSA-2026:50846
Red Hat build of Keycloak 26.6Fixed RHSA-2026:50849
Red Hat build of Keycloak 26.6.5Fixed RHSA-2026:50848
Not affected: 3 products
  • Red Hat Data Grid 8
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Single Sign-On 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-16442
  2. 2026-10-03 Alias added: GHSA-vj6m-hv26-qx79

References

Advisory 6

  • TI-2026-02223 Keycloak: keycloak: unauthorized authentication via disabled saml identity provider CVSS 3.1HIGH 8.1
  • TI-2024-01049 Keycloak: path transversal in redirection validation CVSS 3.1HIGH 8.1
  • TI-2026-13741 Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation CVSS 3.1CRITICAL 9.1
  • TI-2026-13106 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation CVSS 3.1HIGH 8.8
  • TI-2026-02631 Authentication bypass in Red Hat build of Keycloak 26.2 CVSS 3.1HIGH 8.8
  • TI-2026-08505 Keycloak: keycloak: privilege escalation due to oversized subject_token jwt CVSS 3.1HIGH 8.8
See all 110 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences