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TI-2026-00917 Aliases CVE-2026-1190GHSA-63v5-26vq-m4vm

Improper signature verification in Red Hat build of Keycloak 26.4

Priority LOW 15CWE-112Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Partial Red Hat: 2 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.

Summary

A flaw was found in Keycloak's SAML brokering functionality. When Keycloak is configured as a client in a Security Assertion Markup Language (SAML) setup, it fails to validate the `NotOnOrAfter` timestamp within the `SubjectConfirmationData`. This allows an attacker to delay the expiration of SAML responses, potentially extending the time a response is considered valid and leading to unexpected session durations or resource consumption.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00415 36th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 3 without a fix

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—26.4.10-1Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-12Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-12Patch availableCNA
Red HatRed Hat build of Keycloak 26.4.10——Not affectedCNA
Red HatRed Hat JBoss Enterprise Application Platform 8——No fix listedCNA
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack——No fix listedCNA
Red HatRed Hat Single Sign-On 7——No fix listedCNA
—org.keycloak:keycloak-services (Maven)up to 26.5.2—No fix listedGHSA-63v5-26vq-m4vm
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4.10-1 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-12 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-12 Patch available CNA
  • Red Hat build of Keycloak 26.4.10 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat JBoss Enterprise Application Platform 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat JBoss Enterprise Application Platform Expansion Pack VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • org.keycloak:keycloak-services (Maven) Vendor— Affected up to 26.5.2 Fixed in — No fix listed GHSA-63v5-26vq-m4vm

CPE names CNA · 4

CPEVersionsRoleVendor
cpe:/a:redhat:build_keycloak:26.4::el926.4—Red Hat
cpe:/a:redhat:jboss_enterprise_application_platform:88—Red Hat
cpe:/a:redhat:jbosseapxp——Red Hat
cpe:/a:redhat:red_hat_single_sign_on:77—Red Hat
  • cpe:/a:redhat:build_keycloak:26.4::el9 Versions 26.4 — ·Red Hat
  • cpe:/a:redhat:jboss_enterprise_application_platform:8 Versions 8 — ·Red Hat
  • cpe:/a:redhat:jbosseapxp Versions — — ·Red Hat
  • cpe:/a:redhat:red_hat_single_sign_on:7 Versions 7 — ·Red Hat

Remediation

Red Hat 2 advisories

  • RHSA-2026:3948 Released 2026-03-05 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.10 Images Update
    • Red Hat build of Keycloak 26.4 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:3947 Released 2026-03-05 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.10 Update
    • Red Hat build of Keycloak 26.4.10

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat JBoss Enterprise Application Platform 8AffectedNo fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform Expansion PackAffectedNo fix yet: Fix deferred
Red Hat Single Sign-On 7AffectedNo fix yet: Fix deferred
Red Hat build of Keycloak 26.4Fixed RHSA-2026:3948
Red Hat build of Keycloak 26.4.10Fixed RHSA-2026:3947

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-1190
  2. 2026-10-03 Alias added: GHSA-63v5-26vq-m4vm

References

Advisory 3

Other 4

  • 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