CVE-2026-118030
Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse across concurrent logins
CVSS Score
4.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-362 |
| Vendor | red hat |
| Product | red hat build of keycloak |
| Published | Oct 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Red Hat / Red Hat Build of Keycloak
All versions affected Red Hat / Red Hat Build of Keycloak
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
Credits
Red Hat would like to thank Muhannad Alsaif (xNadByte) for reporting this issue.