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CVE-2026-96446— Keycloak-services: keycloak-services: par single-use bypass via prompt=none silent authentication path

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.

A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to t

CVSS 4.2 · Medium
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I. Basic Information for CVE-2026-96446

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: par single-use bypass via prompt=none silent authentication path
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to this bypass, the security rule that ensures a pushed request URI is used only once is not enforced. An attacker could potentially reuse a request URI to obtain multiple authorization codes for a user who is already signed in, violating security standards like FAPI-2.
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
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
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-2026-96446

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III. Intelligence Information for CVE-2026-96446

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Vendor Advisories for CVE-2026-96446 (2)

Same Patch Batch · Red Hat · 2026-09-23 · 6 CVEs total

CVE-2026-96275 8.8 HIGH Flatpak: flatpak: arbitrary write access as root via extra-data extraction
CVE-2026-96512 7.8 HIGH Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authori
CVE-2026-96442 7.8 HIGH Emacs: emacs: arbitrary code execution, incomplete fix for cve-2024-53920
CVE-2026-96445 6.8 MEDIUM Keycloak-services: keycloak-services: conditional otp skip-header policy evaluated against
CVE-2026-96276 Flatpak: flatpak: arbitrary write in host context via flatpak build-init

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-862

V. Comments for CVE-2026-96446

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