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TI-2026-85736 Aliases CVE-2026-107124GHSA-4xg4-7vg6-wc2m

Keycloak session fixation via OIDC logout id_token_hint allows account takeover

Priority LOW 29CWE-384Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 2 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-384.

Summary

The OIDC logout endpoint of the keycloak-services component in Red Hat build of Keycloak sets a session cookie based on an unvalidated id_token_hint before security checks complete. An attacker can fix a session ID in a victim's browser and hijack the victim's later login, gaining full control of the account (CWE-384). Red Hat rates the flaw Moderate, with a CVSS 3.1 base score of 6.4 (MEDIUM). CISA has not added it to KEV.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

A flaw was found in the OIDC logout endpoint of the keycloak-services component, which handles user session termination in Red Hat Build of Keycloak. The issue occurs because the system sets a session cookie based on an unvalidated token hint before completing security checks. An attacker can use this flaw to fix a session ID in a victim's browser, allowing them to hijack the victim's subsequent login and gain full control over their account.

Why it matters now

EPSS 0.00418 36th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat build of Keycloak 26.6—26.6.8-2Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-24Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-24Patch availableCNA
Red HatRed Hat build of Keycloak 26.6.8——Not affectedCNA
Red HatRed Hat build of Keycloak 26.6.8——Not affectedCNA
Red HatRed Hat Single Sign-On 7——No fix listedCNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6.8-2 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-24 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-24 Patch available CNA
  • Red Hat build of Keycloak 26.6.8 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat build of Keycloak 26.6.8 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 2

CPEVersionsRoleVendor
cpe:/a:redhat:build_keycloak:26.6::el926.6—Red Hat
cpe:/a:redhat:red_hat_single_sign_on:77—Red Hat
  • cpe:/a:redhat:build_keycloak:26.6::el9 Versions 26.6 — ·Red Hat
  • cpe:/a:redhat:red_hat_single_sign_on:7 Versions 7 — ·Red Hat

Remediation

Upgrade Red Hat build of Keycloak 26.6 to 26.6-24 or 26.6.8-2, as described in RHSA-2026:95762 and RHSA-2026:95761, both released 2026-11-06. Red Hat build of Keycloak 26.6.8 is not affected. Red Hat Single Sign-On 7 has no fix listed and no plan is available, so it remains affected.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Red Hat 2 advisories

  • RHSA-2026:95762 Released 2026-11-06 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.8 Images Security Update
    • Red Hat build of Keycloak 26.6 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:95761 Released 2026-11-06 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.8 Security Update
    • Red Hat build of Keycloak 26.6.8

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Single Sign-On 7AffectedNo fix yet: Fix deferred
Red Hat build of Keycloak 26.6Fixed RHSA-2026:95762
Red Hat build of Keycloak 26.6.8Fixed RHSA-2026:95761

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-107124
  2. 2026-11-06 Alias added: GHSA-4xg4-7vg6-wc2m
  3. 2026-11-06 Affected versions changed · CNA
  4. 2026-11-06 1 new reference · CNA
  5. 2026-11-06 Fix available: RHSA-2026:95761 · Red Hat
  6. 2026-11-06 Fix available: Red Hat build of Keycloak 26.6.8 · Red Hat
  7. 2026-11-06 CVSS score added · Red Hat
  8. 2026-11-06 Fix available: rhbk/[email protected], rhbk/[email protected], rhbk/[email protected] · CNA
  9. 2026-11-06 1 new reference · CNA
  10. 2026-11-06 Fix available: RHSA-2026:95762 · Red Hat
  11. 2026-11-06 Fix available: Red Hat build of Keycloak 26.6 · Red Hat
  12. 2026-11-07 Priority changed: MEDIUM → LOW

References

Advisory 2

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