TI-2026-67732 Aliases CVE-2026-105306 GHSA-q5jp-7g4g-ch69

Keycloak token introspection audience bypass via dynamic client registration

LOW 28CWE-862Published 2026-10-05 · Updated 2026-10-12

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-862.

Summary

The Dynamic Client Registration flow in Keycloak does not filter security-sensitive client attributes when a new client is created, a Missing Authorization flaw (CWE-862). An attacker with a valid Initial Access Token can register a client that bypasses audience checks during token introspection. The attacker can then read identity information, roles and session details from access tokens of other applications. CVSS 3.1 scores it 6.5 (MEDIUM) with high confidentiality impact, and Red Hat rates it Moderate.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

A flaw was found in the Dynamic Client Registration flow of the Keycloak identity and access management server. The issue occurs because the registration process fails to filter security-sensitive client attributes when a new client is created. An attacker with a valid Initial Access Token can register a client that bypasses audience checks during token introspection. This allows the attacker to view sensitive identity information, roles, and session details from access tokens belonging to other applications in the same realm.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00222 12th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

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

Vendor	Product	Affected versions	Fixed in	Status	Source
Red Hat	Red Hat Build of Keycloak	—	—	No fix listed	CNA
Red Hat	Red Hat Build of Keycloak	—	—	No fix listed	CNA
Red Hat	Red Hat Single Sign-On 7	—	—	Not affected	CNA

Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — Not affected CNA

CPE names CNA · 2

CPE	Versions	Role	Vendor
cpe:/a:redhat:build_keycloak:	—	—	Red Hat
cpe:/a:redhat:red_hat_single_sign_on:7	7	—	Red Hat

cpe:/a:redhat:build_keycloak: Versions — — ·Red Hat
cpe:/a:redhat:red_hat_single_sign_on:7 Versions 7 — ·Red Hat

Remediation

Red Hat Build of Keycloak has no fix listed and no plan available. Red Hat Single Sign-On 7 is not affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Build of Keycloak	Affected	No fix yet

Not affected: 1 product

Red Hat Single Sign-On 7

Timeline

2026-10-05 Threatist record created from CVE-2026-105306
2026-10-05 Alias added: GHSA-q5jp-7g4g-ch69
2026-10-05 Affected versions changed · Red Hat
2026-10-05 CVSS score added · Red Hat

References

Other 2

TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8

See all 7413 →

Sources

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