CVE-2026-1035
Low
Description
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.
SeverityLow
CVSS3.1
Exploit probability—
ProductOrg.keycloak:keycloak-services
PublishedJan 21, 2026
First seenJan 21, 2026
Weakness typeCWE-367CWE-367
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.keycloak:keycloak-servicesMaven | v ≤ 26.2.5 | — |
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