CVE-2026-117859— Keycloak-services: keycloak-services: par single-use bypass via flow restart

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-services 组件的“推送式授权请求（Pushed Authorization Request, PAR）”实现中发现了一个缺陷。当认证流程被重启时，系统会错误地清除用于跟踪 PAR 使用情况的内部标记，同时却保留了该请求的活跃状态。这使得攻击者能够重复使用同一个授权请求来获取多个访问令牌，从而绕过对单次使用请求的安全要求。

CVSS 5.4 · Medium Updated Oct 29, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Keycloak-services: keycloak-services: par single-use bypass via flow restart

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. The issue occurs when an authentication flow is restarted, which incorrectly clears the internal markers used to track PAR consumption while leaving the request active. This allows an attacker to reuse the same authorization request to obtain multiple access tokens, bypassing security requirements for single-use requests.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

控制流实现总是不正确

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 Single Sign-On 7	-	`cpe:/a:redhat:red_hat_single_sign_on:7`

II. Public POCs for CVE-2026-117859

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-117859

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Other References for CVE-2026-117859 (2)

https://access.redhat.com/security/cve/CVE-2026-117859 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2561991 issue-tracking x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-117859

Same Patch Batch · Red Hat · 2026-10-29 · 8 CVEs total

CVE-2026-114488	7.4 HIGH	Wildfly: wildfly-iiop: wildfly-ejb3: wildfly: authentication bypass on iiop ejb invocation
CVE-2026-15564	7.4 HIGH	Wildfly-ejb: wildfly-iiop-openjdk: eap iiop listeners may permit unauthed deserialization
CVE-2026-117548	6.5 MEDIUM	389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schem
CVE-2026-19610	6.5 MEDIUM	Wildfly-platform-mbean: wildfly-platform-mbean: rbac sensitive attribute read bypass for p
CVE-2026-117627	5.4 MEDIUM	Keycloak-services: keycloak-services: jwt authorization grant bypasses identity provider l
CVE-2026-117688	5.3 MEDIUM	Keycloak-services: keycloak-services: vault secret disclosure via client registration inst
CVE-2026-118030	4.2 MEDIUM	Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse acr

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak

Same vendor: Red Hat

Same weakness: CWE-670