CVE-2026-118030 (GCVE-0-2026-118030)

Vulnerability from cvelistv5 – Published: 2026-10-29 06:22 – Updated: 2026-10-29 14:18
VLAI
Title
Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse across concurrent logins
Summary
A flaw was found in the HOTP authentication mechanism of the keycloak-services component, which provides identity and access management services. The issue occurs because the system validates a one-time password and updates its internal counter in two separate steps without proper locking. An attacker with a users password could exploit this timing gap to use a single one-time code to log in multiple times simultaneously.
Severity
4.2 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 14:18 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1077 records in the last 180 days details
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-118030 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2562005 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Build of Keycloak     cpe:/a:redhat:build_keycloak:
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
Create a notification for this product.
Date Public
2026-10-26 13:54
Credits
Red Hat would like to thank Muhannad Alsaif (xNadByte) for reporting this issue.
Show details on NVD website
To clipboard 

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