CVE-2026-1035

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, Keycloaks refresh token rotation hardening can be undermined.

Risk Information

Base Score

3.1

MODERATE

Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Score

Exploitation Probability

0.011

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2026-1035,CVE-2025-14083 are affected in Keycloak-services 26.2.5	Windows
Vulnerabilities CVE-2026-1035,CVE-2025-14083 are affected in Keycloak-services for Linux 26.2.5	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234