CVE-2026-1035 — Org.keycloak.protocol.oidc: keycloak refresh token reuse bypass via toctou race condition
A flaw was found in the Keycloak server during refresh token processing, specifically in the TokenManager class responsible for enforcing refresh token reuse policies. When stri…
Published: 2026-01-21 · CVSS: 3.1 · CVSS 3.1
A flaw was found in the Keycloak server during refresh token processing, specifically in the TokenManager class responsible for enforcing refresh token reuse policies. When strict refresh token rotation is enabled, the validation and update of refresh token usage are not performed atomically. This allows concurrent refresh requests to bypass single-use enforcement and issue multiple access tokens from the same refresh token. As a result, Keycloak’s refresh token rotation hardening can be undermined.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7