Medium 4.2Published Oct 29, 2026

CVE-2026-118030Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse across concurrent logins

Updated under an hour ago (Oct 29, 2026, 3:30 PM ET)

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It affects Red Hat Build of Keycloak and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 4.2 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Oct 29, 2026
First seen by InfoSec Signals: Oct 29, 2026

Affected products

Affected products

Red Hat Red Hat Build of Keycloak redhat:build_keycloak	All versions	CNA record
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on	7	CNA record

References

References

https://access.redhat.com/security/cve/CVE-2026-118030	vdb-entry, x-refsource-redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2562005	issue-tracking, x-refsource-redhat

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.