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TI-2026-61839 Aliases CVE-2026-90997

Authentication bypass by capture-replay in Keycloak

Priority LOW 35CWE-294Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-294.

Summary

A flaw was found in Keycloak. When deployed in stateless mode with MySQL or MariaDB, a mismatch in row-count semantics between the database driver and Keycloak's application logic allows an attacker to bypass replay protection. This vulnerability enables an attacker who intercepts single-use security artifacts, such as JWT client assertions, DPoP proofs, or one-time password (TOTP) codes, to replay them. Successful exploitation grants unauthorized access to the token endpoint or login flow.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00396 34th percentileScored 2026-11-07
Fix Fixed Keycloak (Keycloak): 26.7.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
KeycloakKeycloak26.7.0 to before 26.7.426.7.4Patch availableCNA
Red HatRed Hat Build of Keycloak——Not affectedCNA
Red HatRed Hat Build of Keycloak——Not affectedCNA
  • Keycloak VendorKeycloak Affected 26.7.0 to before 26.7.4 Fixed in 26.7.4 Patch available CNA
  • Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — Not affected CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:/a:redhat:build_keycloak:——Red Hat
  • cpe:/a:redhat:build_keycloak: Versions — — ·Red Hat

Remediation

  • Fix · CNA Keycloak (Keycloak) Fixed in 26.7.4

Vendor assessments

Red Hat

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

Not affected: 1 product
  • Red Hat Build of Keycloak

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-90997

References

Other 2

  • TI-2022-03994 Cross-site scripting in keycloak CVSS 3.1CRITICAL 10.0
  • TI-2017-05120 It was found that the Keycloak Node.js adapter 2.5 - 3.0 did not handle invalid tokens… CVSS 3.0CRITICAL 9.8
  • TI-2017-08952 Weak password recovery in Red Hat Keycloak CVSS 3.0HIGH 8.8
  • TI-2014-03024 The org.keycloak.services.resources.SocialResource.callback method in JBoss KeyCloak… CVSS 3.0HIGH 8.8
  • TI-2026-01295 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users CVSS 3.1HIGH 8.1
  • TI-2017-08950 Insufficient session expiration in Red Hat keycloak CVSS 3.0HIGH 7.5
See all 21 →

Sources

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