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.
CVE-2026-1035
Score 3.1 from GitHub Security Advisory (severity: LOW) published 2026-01-21. NVD baseline CVSS 3.1; sources differ by 0.0.
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 3.1
- EG Score
- 3.1(medium)
- EPSS
- 20.1%
- KEV
- Not listed
Published
January 21, 2026
Last Modified
April 15, 2026
References (4)
- secalert@redhathttps://access.redhat.com/errata/RHSA-2026:6477
- secalert@redhathttps://access.redhat.com/errata/RHSA-2026:6478
- secalert@redhathttps://access.redhat.com/security/cve/CVE-2026-1035
- secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2430314
Patch Availability(3)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | rhbk/keycloak-rhel9-operator:26.4-14 | 2026-04-02 | redhat |
| redhat | rhbk/keycloak-rhel9 | 2026-04-02 | redhat |
| maven | org.keycloak:keycloak-services | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
Maven(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| org.keycloak:keycloak-services | 1.0-alpha-1 ... 9.0.3 (202 versions) | — | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(2)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 9× in last 7d / 36× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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- 2026-05-21 00:35 UTCVendor advisory
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Related CVEs(same product + same vendor + same CWE)
Same product
10 shownmaven:org.keycloak:keycloak-services
Same vendor
10 shownredhat
Frequently asked(5)
What is CVE-2026-1035?
When was CVE-2026-1035 disclosed?
Is CVE-2026-1035 actively exploited?
What is the CVSS score of CVE-2026-1035?
How do I remediate CVE-2026-1035?
Dependency Blast Radius
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