Time-of-check Time-of-use (TOCTOU) Race Condition Affecting org.keycloak:keycloak-services package, versions [,26.4.11)[26.5.0,26.5.6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Jan 2026
- disclosed21 Jan 2026
- creditMohamed Amine ait Ouchebou (mrecho)
Introduced: 21 Jan 2026
CVE-2026-1035 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-services to version 26.4.11, 26.5.6 or higher.
Overview
org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services.
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition via the validateTokenReuse method in the TokenManager class. An attacker can obtain multiple access tokens from a single refresh token by making concurrent refresh requests.