Medium · CVSS 5.4CVE-2026-117859

Keycloak-services: keycloak-services: par single-use bypass via flow restartCVE-2026-117859

Answer in brief

CVE-2026-117859 records a Medium severity (CVSS 5.4) vulnerability in Keycloak-services: keycloak-services: par single-use bypass via flow restart. The current sources do not mark it as known exploited. The current feed maps Red Hat/keycloak-services (generic), Red Hat/rhbk/keycloak-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 29, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Oct 29, 2026Material review Oct 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/keycloak-services (generic), Red Hat/rhbk/keycloak-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/keycloak-servicesgeneric	*	Not reported
Red Hat/rhbk/keycloak-rhel9generic	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/keycloak-services, Red Hat/rhbk/keycloak-rhel9.
Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Evidence timeline and material changes

Published upstream
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 29, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.