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Back to active CVEs
Low · CVSS 3.7CVE-2026-0976GHSA-V897-PV23-R8CW

Org.keycloak/keycloak-quarkus-server: keycloak: proxy bypass due to improper handling of matrix parameters in url pathsCVE-2026-0976

Answer in brief

CVE-2026-0976 records a Low severity (CVSS 3.7) vulnerability in Org.keycloak/keycloak-quarkus-server: keycloak: proxy bypass due to improper handling of matrix parameters in url paths. The current sources do not mark it as known exploited. The current feed maps Red Hat/keycloak-quarkus-server (generic), Red Hat/keycloak-quarkus-server-app (generic), Red Hat/keycloak-quarkus-server-deployment (generic), org.keycloak:keycloak-quarkus-server (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Jan 15, 2026Updated Oct 23, 2026Source checked Nov 7, 2026First seen by HOL Aug 9, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.7
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 3.7. 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-quarkus-server (generic), Red Hat/keycloak-quarkus-server-app (generic), Red Hat/keycloak-quarkus-server-deployment (generic), org.keycloak:keycloak-quarkus-server (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/keycloak-quarkus-servergeneric*Not reported
Red Hat/keycloak-quarkus-server-appgeneric*Not reported
Red Hat/keycloak-quarkus-server-deploymentgeneric*Not reported
org.keycloak:keycloak-quarkus-servermaven<=26.2.5Not reported
org.keycloak:keycloak-quarkus-servermaven>=0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/keycloak-quarkus-server, Red Hat/keycloak-quarkus-server-app, Red Hat/keycloak-quarkus-server-deployment.
  2. 2Review the reported fix. Source-reported workaround: To mitigate this issue, ensure that all administrative and sensitive endpoints within Keycloak are adequately protected by robust authentication and authorization policies, independent of any reverse proxy path filtering. Operators should review Keycloak's internal access controls to confirm that access to these endpoints is restricted to authorized users and roles.

Evidence timeline and material changes

  1. Published upstream

    Jan 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 9, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
Upstream source description

A flaw was found in Keycloak. This improper input validation vulnerability occurs because Keycloak accepts RFC-compliant matrix parameters in URL path segments, while common reverse proxy configurations may ignore or mishandle them. A remote attacker can craft requests to mask path segments, potentially bypassing proxy-level path filtering. This could expose administrative or sensitive endpoints that operators believe are not externally reachable.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-20
Source
CVE List V5
Source checked
Nov 7, 2026
References
6 linked sources
Open source record