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CVE-2026-92855— Keycloak-services: keycloak-services: saml broker accepts holder-of-key assertions without proof of key possession

Quick assessment

Affected

Red Hat Red Hat Build of Keycloak

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 Keycloak 的 SAML 身份代理（identity broker）组件中发现一个漏洞，该组件用于将身份验证委托给外部身份提供方。该问题源于代理未能验证用户是否真正持有与“密钥持有者声明”（holder-of-key assertion）关联的私钥。攻击者若截获了受害者签名的声明，即可重放该声明，从而在无需受害者私钥的情况下获得未授权访问并冒充受害者。

CVSS 7.4 · High Updated Nov 06, 2026

Possible ATT&CK Techniques 2 AI

T1078.003 · Local Accounts T1558.003 · Kerberoasting

Affected Version Matrix 4

Vendor	Product	Version Range	Status
Red Hat	Red Hat Build of Keycloak	`any`	affected
		`any`	affected
		`any`	affected
Red Hat	Red Hat Single Sign-On 7	`any`	affected

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Vulnerability Information

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Vulnerability Title

Keycloak-services: keycloak-services: saml broker accepts holder-of-key assertions without proof of key possession

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the SAML identity broker component of Keycloak, which is used to delegate authentication to external identity providers. The issue occurs because the broker fails to verify that a user actually possesses the private key associated with a holder-of-key assertion. An attacker who intercepts a victim signed assertion can replay it to gain unauthorized access and impersonate the victim without needing their private key.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Build of Keycloak	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Build of Keycloak	-	`cpe:/a:redhat:build_keycloak:`
Red Hat	Red Hat Single Sign-On 7	-	`cpe:/a:redhat:red_hat_single_sign_on:7`

II. Public POCs for CVE-2026-92855

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-92855

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Other References for CVE-2026-92855 (2)

https://access.redhat.com/security/cve/CVE-2026-92855 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2535814 issue-tracking x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-92855

Same Patch Batch · Red Hat · 2026-11-05 · 24 CVEs total

CVE-2026-117691	9.1 CRITICAL	Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-e
CVE-2026-97175	8.8 HIGH	Keycloak-services: keycloak-services: unverified idp email auto-linking enables account ta
CVE-2026-121994	8.8 HIGH	Gdb: gdb: stack buffer overflow in fetch_register_using_p via unchecked p-reply length
CVE-2026-121996	8.2 HIGH	Gdb: gdbserver: heap disclosure and wild pointer in gdb_parse_agent_expr via untrusted age
CVE-2026-92857	8.1 HIGH	Keycloak-services: keycloak-services: dcr protocol mapper config not validated, allowing i
CVE-2026-121997	8.1 HIGH	Gdb: gdbserver: heap buffer overflow in cmd_qtdpsrc via qtdpsrc declared/actual length mis
CVE-2026-114232	8.1 HIGH	Keycloak-services: keycloak-services: uma protection api resourcetype field not validated
CVE-2026-112208	8.1 HIGH	Keycloak-services: keycloak-services: account takeover via stale sso_auth note in organiza
CVE-2026-96453	8.0 HIGH	Org.keycloak/keycloak-admin-cli: keycloak-admin-cli: kcadm custom truststore accepts arbit
CVE-2026-107912	7.7 HIGH	Io.quarkus/quarkus-vertx-http: quarkus-vertx-http: authorization bypass in management inte
CVE-2026-121995	7.5 HIGH	Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail
CVE-2026-107123	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated cpu denial of service via saml xml d
CVE-2026-103112	7.5 HIGH	Keycloak-services: keycloak-services: account takeover via authentication race using reset
CVE-2026-107602	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo
CVE-2026-110931	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authori
CVE-2026-110932	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated persistent disk exhaustion via theme
CVE-2026-82965	7.5 HIGH	Keycloak-services: keycloak-services: unauthenticated denial of service via saml soap endp
CVE-2026-93998	7.4 HIGH	Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to the configur
CVE-2026-97847	7.1 HIGH	Keycloak-services: keycloak-services: client manager can substitute sessionless token prin
CVE-2026-97174	6.8 MEDIUM	Keycloak-services: keycloak-services: ciba sub parameter injection causes attacker authent

Showing top 20 of 24 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak

Same vendor: Red Hat

Same weakness: CWE-287