CVE-2026-96447— Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding

Quick assessment

Affected

Red Hat Red Hat build of Keycloak 26.6.8

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在开源身份与访问管理解决方案 Keycloak 的 TokenManager 组件中发现了一个漏洞。该问题出现在对无状态访问令牌进行验证时：当原始用户 ID 已不存在时，Keycloak 会错误地回退到使用用户名来识别用户，而并未验证该身份是否与原始令牌主体相匹配。这可能导致攻击者利用旧令牌，访问一个新建的服务账户，前提是该服务账户与之前被删除的账户共享相同的客户端 ID（client ID）。

CVSS 4.2 · Medium Updated Nov 06, 2026

Possible ATT&CK Techniques 2 AI

T1550 · Use Alternate Authentication Material T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the TokenManager component of Keycloak, an open-source identity and access management solution. The issue occurs during the validation of stateless access tokens when the original user ID no longer exists. Keycloak incorrectly falls back to using the username to identify the user without verifying if the identity matches the original token subject. This could allow an attacker with an old token to gain access to a newly created service account if it shares the same client ID as a previously deleted one.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

认证机制不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat build of Keycloak 26.6.8	-	`cpe:/a:redhat:build_keycloak:26.6::el9`
Red Hat	Red Hat build of Keycloak 26.6.8	-	`cpe:/a:redhat:build_keycloak:26.6::el9`
Red Hat	Red Hat Single Sign-On 7	-	`cpe:/a:redhat:red_hat_single_sign_on:7`

II. Public POCs for CVE-2026-96447

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-96447

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Other References for CVE-2026-96447 (3)

https://access.redhat.com/security/cve/CVE-2026-96447 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2539288 issue-tracking x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95761 vendor-advisory x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-96447

Same Patch Batch · Red Hat · 2026-11-06 · 15 CVEs total

CVE-2026-109081	6.8 MEDIUM	Keycloak-services: keycloak-services: injection of roles into realm default-roles via dcr
CVE-2026-19688	6.8 MEDIUM	Keycloak-services: keycloak-services: admin api missing audience check
CVE-2026-123037	6.7 MEDIUM	Ansible-core: user module generate_ssh_key follows a symlinked ~/.ssh enabling local privi
CVE-2026-96547	6.5 MEDIUM	Keycloak-services: keycloak-services: dcr registration-time claim-path gap allows forging
CVE-2026-97848	6.5 MEDIUM	Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sa
CVE-2026-9797	6.5 MEDIUM	Keycloak: keycloak: privilege escalation via client authentication manipulation by an auth
CVE-2026-107124	6.4 MEDIUM	Keycloak-services: keycloak-services: oidc logout endpoint session fixation via id_token_h
CVE-2026-97367	6.4 MEDIUM	Keycloak-services: keycloak-services: dcr azp and sid claim substitution allows account re
CVE-2026-120749	6.2 MEDIUM	Dbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) when a broadcast from the driver
CVE-2026-96460	5.4 MEDIUM	Keycloak-services: keycloak-services: indefinite access token renewal via standard token e
CVE-2026-92856	4.9 MEDIUM	Keycloak-services: keycloak-services: saml broker ignores proxyrestriction delegation cons
CVE-2026-121837	4.3 MEDIUM	Quarkus-rest-data-panache: quarkus-rest-data-panache: getter-level @securefield ignored fo
CVE-2026-83493		Distributed-workloads: github actions pinned by mutable tag/branch, including third-party
CVE-2026-83494		Training-operator: pytorchjob validateupdate casts oldjob from newobj, bypassing managedby

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.6.8

Same vendor: Red Hat

Same weakness: CWE-287