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TI-2026-00740 Aliases CVE-2026-0976GHSA-v897-pv23-r8cw

Org.keycloak/keycloak-quarkus-server: keycloak: proxy bypass due to improper handling of matrix parameters in url paths

Priority LOW 18CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

A flaw was found in Keycloak. This improper input validation vulnerability occurs because Keycloak accepts RFC-compliant matrix parameters in URL path segments, while common reverse proxy configurations may ignore or mishandle them. A remote attacker can craft requests to mask path segments, potentially bypassing proxy-level path filtering. This could expose administrative or sensitive endpoints that operators believe are not externally reachable.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00489 42nd percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 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 26.4.9——Not affectedCNA
Red HatRed Hat Build of Keycloak——No fix listedCNA
Red HatRed Hat JBoss Enterprise Application Platform 8——No fix listedCNA
Red HatRed Hat JBoss Enterprise Application Platform 8——No fix listedCNA
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 JBoss Enterprise Application Platform Expansion Pack——No fix listedCNA
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack——No fix listedCNA
—org.keycloak:keycloak-quarkus-server (Maven)up to 26.2.5—No fix listedGHSA-v897-pv23-r8cw
  • Red Hat build of Keycloak 26.4.9 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat JBoss Enterprise Application Platform 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat JBoss Enterprise Application Platform 8 VendorRed Hat Affected — Fixed in — No fix listed 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 JBoss Enterprise Application Platform Expansion Pack 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
  • org.keycloak:keycloak-quarkus-server (Maven) Vendor— Affected up to 26.2.5 Fixed in — No fix listed GHSA-v897-pv23-r8cw

CPE names CNA · 4

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

Remediation

Red Hat 1 advisory

  • RHSA-2026:2365 Released 2026-02-09 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.9 Security Update
    • Red Hat build of Keycloak 26.4.9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Build of KeycloakAffectedNo fix yet
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 build of Keycloak 26.4.9Fixed RHSA-2026:2365

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-0976
  2. 2026-10-03 Alias added: GHSA-v897-pv23-r8cw
  3. 2026-10-22 Fix available: RHSA-2026:2365 · Red Hat
  4. 2026-10-23 Affected versions changed · CNA
  5. 2026-10-23 1 new reference · CNA
  6. 2026-10-23 Fix available: Red Hat build of Keycloak 26.4.9 · Red Hat
  7. 2026-10-23 1 new reference · GHSA-v897-pv23-r8cw

References

Advisory 2

Other 3

  • 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 7412 →

Sources

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