CVE-2026-92856— Keycloak-services: keycloak-services: saml broker ignores proxyrestriction delegation constraints

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.

在身份与访问管理解决方案 Keycloak 的 SAML 代理（brokering）组件中发现了一个漏洞。当 Keycloak 作为上游身份提供商与下游服务之间的中介时，该问题会被触发。Keycloak 未能遵守登录消息中指定的名为 ProxyRestrictions 的安全指令。这导致即使用户的上游身份提供商明确禁止进一步共享登录会话，用户仍能够登录到下游服务。因此，用户可以绕过旨在限制其身份使用范围的安全边界。

CVSS 4.9 · Medium Updated Nov 06, 2026

Possible ATT&CK Techniques 2 AI

T1078 · Valid Accounts T1550 · Use Alternate Authentication Material

Get alerts for future matching vulnerabilities Log in to subscribe

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

Keycloak-services: keycloak-services: saml broker ignores proxyrestriction delegation constraints

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

授权机制缺失

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 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-2026-92856

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-92856

请登录查看更多情报信息。

Other References for CVE-2026-92856 (3)

https://access.redhat.com/security/cve/CVE-2026-92856 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2535815 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-2026-92856

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-2026-121837	4.3 MEDIUM	Quarkus-rest-data-panache: quarkus-rest-data-panache: getter-level @securefield ignored fo
CVE-2026-96447	4.2 MEDIUM	Keycloak-services: keycloak-services: stateless token preferred_username fallback enables
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-862